SECRET 

MUST NOT FALL INTO HANDS OF ENEMY 

MEMORIZE THIS GROUP: "DAM. Code Lost." 

The "COLORADO" CODE 

GENERAL HEADQUARTERS 

AMERICAN EXPEDITIONARY PORCES 

This book has been issued to ________________

for official use under his direction only. 

By COMMAND OF GENERAL PERSHING: 


Official : 
ROBERT C. DAVIS, 
Adjutant General. 



JAMES W. McANDREW, 
Chief of Staff. 



INSTRUCTIONS 

1. This code book, to be known as the "Colorado" Code, is 
issued to all combatant troops down to battalions. 

It is primarily intended for communication within the divi- 
sion, but may be used for messages to higher headquarters. 

Messages encoded by its use may be transmitted by any 
means at hand, but radio or earth telegraphy should be used 
only when more secret means are not available. 

2. Messages once transmitted in clear or in any other code 
or cipher must not be repeated in this code. 

Messages once transmitted in this code must not be repeated 
in any other code or cipher or in cle;ir. 

Except that number and hour of signature may be in clear 
when preceding first code group, the use of "clear" in code 
messages is prohibited. 

.3. The use of this code for regular routine reports should 
Ik- limited to actual necessities. Such reports should be trans- 
mitted by other means than radio or earth telegraphy. 

4. Avoid use of words not in code book when other words 
with same significance are provided. Words spelled out, letter 
by letter, not only take time to code, transmit and decode, but 
they are one of the favorite points of attack by enemy code 
men. 

5. Where two or more code groups are assigned the same 
letter, syllable, word or phrase, first one and then another 
should be used so that in a series of messages each occurs about 
the same number of times. In particular, no group should ever 
appear twice in the same message. 

6. At least (me group marked "Null" should be used for 
every ten code groups in a message. These should be placed at 
irregular intervals. A "Null" should always occur between 
double letters; thus the word "boot" would be encoded: 

(b) (Null) (o) (t) 

PS J YWX XOG PFV SBY 

.Vote that different groups are used for the letter "0." 

7. Coded and decoded copies of messages must never be filed 
together. All notes and memoranda used in coding or decoding 
messages must always be destroyed, by burning, if practicable. 

8. Messages must be short. Several short messages will be 
less likely to be read by the enemy than one long one. 

Except in emergency, a long message, if it must be sent, will 
be divided into two or more parts and each sent as a complete 
message. 

Very often the best way to handle a long message is to leave 
out unnecessary words. 

9. Addresses will not be used when context of message indi- 



cates for whom intended. When used, thej' must he in code. 

10. Signatures should be sent only when absolutely required. 
When sent, they must he encoded, letter hy letter, if necessary. 
Usually it will he sufficient to indicate origin by some word in 
code book previously agreed upon by each commander and his 
immediate subordinates. 

11. The message handed Signal Corps operator should he in 
the following form, on any suitable paper: 

"No. 1. 15:40 PSJ YWX XOG PFV SBY 

Send this message to First Division. 

J. M. 
1 June, 1918 Capt., 1st Infantry" 

Items should always appear in this order, that is: 

(a) Number of message. 

(b) Hour of signature. 

(c) Body of message. 

(d) Order directing transmission. 

Order directing transmission may also indicate means to be 
tin ployed when deemed necessary by the Commanding Officer, 
but this will, in general, be left to the discretion of the Signal 
Corps. 

Number of mes'sage and hour of signature should be given 
only when they will serve some good purpose. They will be in 
clear. 

Body of message must he entirely in code. 

12. Blank spaces at end of book are for use of divisions for 
designation of organizations and local geographical points, or 
for such other use as may be desired. 

Words assigned will be reported to Corps, Army and General 
Headquarters, and to neighboring divisions. 



ENCODING 




0 ... .FWP. 
1 ... .KSU. 
2 ... .NBX. 
3 ... .YMJ. 
4 ... .LPW. 
5 ... .MCA. 
6 ... .BFC. 
7 ... .RPA. 
8 ... .PWY. 
9 ... .RBJ. 
10 ... .FCV. 
11 ... .JFU. 
12 ... .VSY. 
13 ... .BNA. 
14 ... .QJC. 
15 ... .GNU. 
16 ... .RGS. 
17 ... .JBK. 
18 ... .OXW. 
19 ... .BGR. 
20 ... .YWU. 

.NXO. 

.PSA. 

.GVJ. 

.JWC. 

.NPJ. 

.PFJ 

.LYW 

.VPA 

.SMD 

.GFU. 

.BKV 

.KBV 

.YPF 

.SNW 

.VJC. 

.ABW 

.RWB 

.NGA 

.JPL 

.DYW. . 

.VSA 

.JSC 

.NBL 

.CUY 

.XJG. . 

.GNA 

,RMY 

.APB 

YBM 

MGI. . 



.OCM 
.RYV. 
.JPS. 
SPF. 
.GKX, 
.FBL. 
.MYV. 
.CPS. 
.JXW. 
QYA. 
GBL. 
ZBW. 
NYK. 
CFX. 
PLB. 
SGA. 
NSV. 
DGA. 
RBY. 
DPL. 
XJM. 
BPG. 
SCO. 
KXO. 
NFC. 
QMX 



CMX 



MGX 



RKC 



WCA 



DCA 



.DMA 
.AGL 
.DSK 
.PCB 
.QBG 
.KPW 
.OMJ 
.MSG 
.GSC 
.NGW 
.DCM 
.XPO 
.CJF 
.DWA 
.NWJ 
.XBC 
.GNP 
.KXY 
.XYM 
.RFY 
.OWY 
. QPJ 
.FGN 
.OPB 
.MBC 





51... .MPL 
52... .VJS 
53... .SXB 
54... .GMA 
55... .MXF. 
56... .SWA 
57... .OGX 
58... .GYM 
59... .DXJ 
60... .VNO. 
61... .OSX 
62... .DYN 
63... .FYM 
64...ZBA 
65... .XMY. 
66... .OGA 
67... .DPA 
68... .BWJ 
69... .J3Y 
70...OBX. 
71...VYW 
72...DMX 
73...KMY 
74...WJX 
75...GVA. 
76...AXW 
77...XGD 
78...SKC 
79...ONS 
80...CPA. 

Nulls: 


81...PYW 


SKP 


82...GXO 


VBY 


83...CFG 


XOB 


84. ...JMS 


AUS 


85...wxv 


GWS 


86....RFK 
87. ...OBL 
88....JFC 
89....CBA 
90....OPW. 
91....SBN 
92.... QPM 
93. ...GMS 
94....LBX 
95. ...PWA 

1 96....GPC 


| 97. ...YBW 


98. ...QVM 


99. ...GWU 




100. .  DGX. 



.VBX 



PBL 



VCX 



,WSX 



ORF 



LGJ 



LYB 



Nulls: 
XWO 
YXO 
WJS 
PNW 
LUW 



JUW. .RPX. .WPA 



4.2. . .XFO 
4.7. . .PEB 
5.9. . .GLO 
6-inch. . .JOB 
9 . 2 ... SAN 
9.45. . .WUM 
9.5. . .LYT 
155. . .COM 
240. . .AMG 



A. . .YPO. .RFS. .GKO. .XPA 

Abandon . . . RAB 

Able. . .GOS 

About . . . CMA 

About to advance. . .PUF 

Above. . .KPL 

-ac. . .FAT 

Accident. . .ROK 

Accidentally wounded. . .XUO 

According. . .DON 

Accurate. . .LEM 

Acknowledge. . . JOK 

Act. . .SAD 

Action. . .PBO 

Active. . .GES 

Activity. . .VOW. .GOC 

Adjoining. . .MSY 

Adjust. . .SUC 

Adjusting. . .NOR 

Adjutant. . .JWA 

Advance. . .VAP 

Advance guard. . .BEF 

Advancing. . .FXO. .LGA 

Advantage. . .VMS 

Advisable. . .POK 

Advise. . .MEN. .PYN 

Advise when completed. . .CSM 

Advised. . .FJS 

Aeroplane. . .GUK Nulls: 

After... NEP RED 

Afternoon. . .OWG APX 

Again... RYF MYS 

Against. . .WNO OBN 

Age...KBA XOG 

Agree. . .FMY 

Aim. . .OLP 

Air. . .ZVC 



-al. . .JAP 
Alert. . .FED 
All. . .LPA. .YJB. .VXS 
All communications cut...GFK 
All points. . .FPN 
All ready. . .BPU 
All returned. . .DEL 
All right. . .JGV 
All stations. . .OSA 
All well. . .QXG 

All your messages received. . .DEB 
Alone. . .KVS 
Along. . .PJM 
Also. . .JYM 
Alter. . .SON 
Altogether. . .WMV 
Always. . .DWS 
Am. . .FMB. .NCW. .QMJ 
Am not. . .XMC 
Ambulance. . .CPK 
Ammunition. . .BFW. .CSY. .VBA 
Ammunition depot... PBX 
Ammunition exhausted. . .FGC 
Ammunition for. . .GWK. .RMJ 
Among . . . GPV 

An. . .ASF. .GSX. .YMS. .JSY 
-ance. . .OKU 

And. . . JUM. .OLD. .ROT. .GOK. .COG 
Angle. . .FCB 
Announce . . . SWO 

Annoy... XON Nulls: 

Answer. . .DAL. .BOK DGW 
-ant...SMY BNC 

Antenna. . .FRM QVK 

Anti-aircraft. . .GAV COF 
Any . . . LBC YUX 

Apparatus. . .VPO 
Apparent. . .FLO 
Appear. . .REP 
Approach. . .GKB 
Approve. . .SYL 
Approximate. . .WBM 
Approximately. . .CUN. .AGB 
April. . .YXW 
-ar. . .JOV 
Are. . .FGW. .BNX. .MJV 



-com... .PXS. .JWY 


-en. ...NWY. .RPO. .SGR 


-con... . PNR . . FSM 


-er. ...FBS. .JBM. .AWG 


-dis... .YAL. .FES 


-es. ...SPU..XBW..GSO 


-ed. ...KMC. .VBO. .XWS 


-ing... .FWA. .NPY. .QEM 



Are having. . .PAT 




Away . . . JWS 




Are not. . .SXW 




Axe (s) . . .NYB 




Are we . . . CSA 




B. ..PSJ. .DCV. .BWA 


A 


Are you. . .DUL 




Back...YFM 




Are you all right. . .FPA 




Bad (ly). . .VYG 




Arm. . .PWO 




Badly damaged. . .BKM 




Armored. . .QOY 




Badly wounded. . .DYF 




Army. . .DOS. .AUF 




Bag (s) . . .VEN 




Army headquarters. . .BYW. 


DXS 


Balloon. . .QYO 




Arrive. . .XSO 




Bank. . .MER 




Arrived. . .ZOY. .CMO. .FPC 




Barbed wire. . .NPA. .GFB 




Artillery. . .KSM. .YJW. .XMP 




Barrage. . .NYS. .VCP. .BGN 




Artillery fire. . .CJV 




Barrage wanted. . .DOG 




Artillery observer. . .ANK 




Barricade. . .MUS 




Artillery position. . .FON 




Battalion. . .YAX. .WAP. .BAR 


Artillery preparation. . .WAV 


Battalion headquarters...DM0 


Artillery support ... REL 




Battery. . .VCA. .AFM. .GXY 


[NXB 


-ary. . .FOK 




Battle (s). . .VAB 




As. . .GBX. .XWC. .FLB 




Bavarian. . .WSM 




As far as . . . BSY 




Bay (s)...FRX 




As soon as. . .LUM. .NUK 




Bayonet. . .GAL 




Ascertain. . . ONC 


Nulls: 


Be. . .LGW. .SNG 


Nulls: 


Ask . . . PNB 


LAY 


Be ready. ..VPK 


PJV 


Asphyxiate. . .GLX 


ROB 


Be released. . .BES 


FWY 


Assemble. . .FUG 


GNW 


Because . . . FMP 


VSX 


Assist. . .BLU 


PAY 


Been. . .JAW. .SYM 


GFY 


Assistance. . .AXF 


WYS 


Before. . .QXP 


PXM 


At. . .JAC. .SYK. .YON. .COT 




Began . . . PBA 




At close quarters. . .DGO 




Begin. . .JOM. .FAK 




At once. . .WPX. .XSA 




Begun . . . BMP 




At point. . .YSJ 




Behind. . .JGF 




-ate. . .DSX 




Behind the lines. . .MXY 




Attack. . .BXM. .YWA. .SMP 




Being. . .NUW. .VMC 




Attacked. . .RGK 




Being established. . .QSM 




Attacking. . .LPY 




Being sent . . .AUX 




Attempt. . .JXM 




Being shelled. . .DAR 




Attention. . .WEB 




Believe. . .WXG 




August . . .ABM 




Belong. . .VXK 




Austrian. . .DPX. .NGP 




Below. . .QPX 




Automatic. . .OVX 




Belt (s)...JYG 




Automatic rifle... JSM 




Bengal flares. . .FUN 




Automatic rifle ammunition. . .RPV 


Best . . . RBS 




Available. . .JPY 




Better. . .SBC 




f viator. . .BNO 




Between. . .RAS. .LOR 




Await. . .KGM 




Beyond . . . AMX 




Await instructions. . .VNY 




Billet (s). . .FRA 





-ion... .NOG. .OVA. .DAW 


-re... .RWU. .QVC 


-iy.... GFP . . JFY 


-s. ...LYN. .ASV. .DPG. .0MB 


-nd. ...MXA. .NWP. .ANP 


-St... .PWJ. .BPA. .SXM. .GMC 


-nt. ...OPL 


-th... .KMS. .NFW. .PLX 



Bivouac. . .VSG 




Caliber. . .SGW 




Black. . .NPS 




Call. . .PAK. .NOP 




Block. . .JVC 




Camouflage. . .JUF 




Blue. . .KVO 


I 


Can. . .KBM. .BMD 




Blue rocket. . .PUN 




Can be . . . CBO 




Board. . .RYM 




Canal . . . FXA 




Boche. . .GOW 




Cancel. . . JPB 




Body . . . AP J 




Cannot. . .NOB. .LUG. .RON 




Bomb. . .FRS. .MPY. .OGN 




Cannot advance . . . SBX 




Bombard. . .QJW 




Captain . . . VAK 




Bombarded. . .BSJ. .DEP 




Captive balloon. . .PCM 




Bombardment . . .MOV 




Capture . . . NEF 




Bombing. . . OBA 




Captured. . . JBU. .BGA. .KPY 


Bombing post...X0S 




Capturing. . .OMU 




Bomb-proof. . .ZBJ 


Nulls: 


Car . . . PNX 




Border. . .MAK 


XAV 


Carry. . .QOL 




Both. . .NAW 


OWN 


Cartridge. . .VBS 




Bottom. . .OGS 


DOC 


Case . . . BAK 




Box . . . ROF 


JYL 


Cast-iron. . .DAC 




Branch . . . QVX 


DUP 


Casualties. . .FOV. .GUS. .1 


es of communication 


OYP... .Has not 


RFX... .Will be made 


QYV... .To be 


RFY... .19 


OYW... .Field 


RGA... .Sign 


QYX... .This afternoon 


RGD... .Field 


RAB... Abandon 


RGF... .Why 


RAC... .1 


RGK... ..Attacked 


RAG... .Exact 


RGN... .Plane 


RAK 




RGO... .Help 


RAM... .By platoon (s) 


RGP... .Platoon 


RAN... .Working party 


RGS... .16 


RAP...Postpone 


RGU... .River 


RAS... .Between 


RGW... .Wind favorable 


RAT... .With 


RGX... .Depth 


RAV... .Rifle 


RKB... .Post of command 



III 



RKC...40 


RUX...G 


RKM... .Officer 


RWB...37 


RKO...Patrol reports 


RWC...Post 


RKP...X 


RWK...Rations 


RKS...Demand 


RWM... .Compel 


RKV...Passed quietly 


RWO... .Rapid 


RKY 




RWP....Will 


RMB...Favorable 


RWS... .Down 


RMC...Thin 


RWU... .-re 


RMJ...Ammunition for 


RWX... .Were 


RMO...Into 


RWY... .-el 


RMP...Weather 


RYB...On the way 


RMS. ...Disturb 


RYF... .Again 


RMV...Receive 


RYG... .From 


RMX... -tion 


RYK...First 


RMY...47 


RYL...P 


ROB... (Null) 


RYM...Board 


ROC...Length 


RYN...Received 


ROF...Box 


RYP...Finish 


ROG...Made 


RYS...So 


ROK...Accident 


RYV...1 


ROM...Minute 


RYW...Grenade 


RON...Cannot 


SAC...With . 


ROP...Had 


SAD...Act 


ROS...In writing 


SAG...Placed 


ROT...And 


SAK...Entanglements 


ROV...Nothing 


SAM...Leave 


ROW...Message not understood 


SAN...9.2 


ROX...Intelligence 


SAP...N 


RPA...7 


SAR. 


'.Evening 


RPB... Hyphen 


SAT...In our hands 


RPC...Could not 


SAV...Could 


RPJ...Written 


SAW...Region 


RPN...General 


SAY...Where 


RPO... -en 


SBA...Long 


RPS...Want 


SBC...Better 


RPV...Automatic rifle ammunition 


SB J...Will be 


RPW...Stokes 


SBL...In force 


RPX...100 


SBN...91 


RPY...May 


SBO. ...May be 


RUB...Trench 


SBP...Wear 


RUC...Enemy infantry 


SBV. ...Dead 


RUG... Working party 


SBW...Wait 


RUK...Clearing 


£BX. ...Cannot advance 


RUM...S 


SBY...T 


RUN...Fall 


SCB...Dugout 


RUP...Ton 


SCF...Wind 


RUS ... Combat train 


SCK...Message understood 


RUT...Without 


SCO. ...22 


P.UW...Explode 


SCP...Magazine 



41 



scu... .Joined 


SOV. 




sew...Men wounded 


SOW...Disable 


SGA...15 


SOX....J 


SGB...Saw 


SPA...Our artillery is shelling 


SGF...Tonight 


SPB...Your sector fus 


SGK...Hit 


SPF...3 


SGM... .You 


SPG...Part 


SGO...By rocket 


SPK...Trench mortar 


SGP...What 


SPL... .Does 


SGR...-en 


SPN...Raise 


SGV...Men gassed 


SPO...Zero hour 


SGW...Caliber 


SPU... -es 


SGX... .Z 


SPW...This 


SKB...Report 


SPX...During 


SKC...78 


SPY...Reply 


SKM...Occupied 


SUB 




SKO...Flash 


sue...Adjust 


SKP... . (Null) 


SUG 




SKV...Brigade headquarters 


SUK...Ought to 


SKX...Probably 


SUL...Machine gun ammunition 


SKY...Hand grenade 


SUM...Counter attack 


SMA...East of 


SUN...Passed 


SMC...Opposite 


SUP...From 


SMD...29 


SUR...End 


SMG...Under fire 


SUW 




SMK... . floderv 


SUY...Rate 


SMO...To 


SWA....56 


SMP...Attack 


SWB...Interrupt 


SMU...Soon 


SWC...E 


SMX...How 


SWJ...In the direction of 


SMY... -ant 


SWM...Inch 


SNA...Open fire 


SWO...Announce 


SNB...Our aviator 


SWP...Minus 


SNF...Indicate 


SWU...Why 


SNG...Be 


SWX...Have you 


SNO...Needed 


SWY...Patrol reports 


SNP...Send out patrols 


SXB...53 


SNV...Much 


SXG...It 


SNW...34 


SXJ...Not 


SNX...Lift 


SXM...-St 


SNY. ...We are in need of 


sxo...We were 


SOB...Front 


SXP...Raid will take place 


SOF...Come 


SXV...T 


SOG...Trenches 


SXW...Are not 


SOK...Weak 


SXY. ...You will be relieved 


SOL...Halt 


SYB. ...Report 


SOM. ...You will be. relieved 


SYF. ...Kilometer (s) 


SON. ...Alter 


SYG 




SOP. ...L 


SYK. ...At 


SOR. ... -un 


SYL. ...Approve 



42 



SYM... .Been 


VJS...52 


SYN... .Operator 


VJW...Occupy 


SYP...Our artillery is firing 


VJX...Rear 


SYV... .Driven out 


VJY...This 


SYW...Position 


VMA....Force 


VAB...Battle (s) 


VMB 




VAF...Recall 


VMC...Being 


VAG, 




VMJ...Raid will take place 


VAK... Captain 


VMO...Sending 


VAM...Reply 


VMP...Food 


VAN... Saturday 


VMS... Advantage 


VAP... Advance 


VMX...T 


VAS...Understood 


VMY...Gun 


VAT...During 


VND...Control 


VAW... .Other 


VNF...Have been 


VAX...Set 


VNG...Flare 


VBA...Ammunition 


VNK...Your 


VBC...Zero hour has been post- 


VNO...60 


VBJ... Engineers [poned 


VNP...Proceed 


VBM...In force 


VNS...What 


VBO...-ed 


VNU...Does 


VBP...Wide 


VNW...-un 


VBS...Cartridge 


VNX...Period 


VBW...Your 


VNY...Await instructions 


VBX...55 


VOC...Way 


VBY... (Null) 


VOD...Losses 


VCA...Battery 


VOG...Trench cleaners 


VCF 




VOK...Resist 


VCJ...Loophole 


VOL...Coming up 


VCO...Killed 


VOM...We hold the line 


VCP...Barrage 


VON...Enemy patrol 


VCS...Target 


VOP... July 


VCU...Lengthen 


VOR...Is there any gas 


VCW...In our trenches 


VOW...Activity 


vex...65 


VOY. 


:p 


VEB...Gas attack 


VPA...28 


VEF 




VPB...Wounded 


VEG...J 


VPF...Few 


VEK...Counter 


VPG...Lines 


VEL...Succeed 


VPK...Be ready 


VEM... Removed 


VPL...K 


VEN...Bag (s) 


VPN...Under 


VEP...Parole 


VPO...Apparatus 


VES...First 


VPS...Men wounded 


VEW 




VPU...Where 


VJB...Brigade 


VPW...By runner 


VJC...35 


VPX...Right 


VJM 




VPY...Z 


VJO...Flame thrower 


VSA...41 


VJP...Patrol 


VSD...Opposite 



43 



VSF... .Green rocket 


VSG...Bivouac 


VSJ... .On time 


VSM... .East 


VSO...Original 


VSP...Machine gun emplacement 


VSX... (Null) 


VSY... .12 


VXA...Your company 


VXB....Operation cancelled 


VXF...Enemy firing gas grenades 


VXG... .Quartermaster 


VXK... .Belong 


VXM... .Visual 


VXO...Much 


VXP 




VXS...All 


VXW... Up 


VXY...Minenwerfer 


VYB 




VYF...Rest 


VYG...Bad (ly) 


VYK...We 


VYL...Mist 


VYM...Thirty-seven (37) mm. 


VYN...Dark 


VYP...Very 


VYS...His 


VYW...71 


WAB...Uniform 


WAC...Depot 


WAJ...Parachute 


WAM...When shall we be relieved 


WAP...Battalion 


WAR...Has had 


WAS...Know 


WAV. ...Artillery preparation 


WAX...Our 


WAY...Destroyed 


WBC...Need 


WBJ...Lieutenant 


WBL 




WBM. ...Approximate 


WBO...U 


WBP...Divide 


WBS. ...We are losing heavily 


WBV. ... Send up 


WBX. ...Gas battery 


WBY. ...Zero 


WCA... .45 



WCF. . .One 
WCK. . .Third 
WCO. . .Eighth 

WCP 

WCS. . .Degree (s) 
WCU . . . Tear 

WCX 

WEB. . .Attention 

WEF 

WEG. . .Model 

WEP. . .Under 

WES. . .D 

WEV. . .Refer 

WEX. . .Stationary 

WJA. . .Regiment 

WJB . . . Code 

WJC. . .Urgently 

WJG. . .Increase range 

WJM. . .Us 

WJO. . .Cross 

WJP... Signal rocket 

WJS... (Null) 

WJV. . .V. B. ammunition 

WJX. . .74 

WJY . . . U 

WMA . . . Much 

WMB. . .Considerable 

WMC. . .Pass 

WMJ. . .Knife (ves) 

WMO . . . Dummy 

WMP. . .Search 

WMS. . .Received 

WMV. . .All together 

WMX. . .Very pistol 

WMY. . .Retreat 

WNA. . .Establish 

WNB ... To 

WNC. . .Resistance 

WNG. . .Trench mortar ammunition 

WNO. . .Against 

WNP . . . Your 

WNS. . .Diminish 

WNV. . .Wounded 

WNX. . .Silenced 

WNY. . .Death 

WOB. . .Slightly wounded 

WOF. . .Situation 

WOG... Since 

WOK. . .Evacuated 

WOL. . .Men killed 



44 



WOM...Exhausted 


WYO...Connect 


WOP....Cut 


WYP...Occupied 


WOS... Parapet 


WYS... Null) 


wov...On this side 


WYV...Out 


wox...Observation post 


WYX...Glasses 


WOY...Hand 


XAB...Daily 


WPA...10! 


XAC...Fourth 


WPB...Gas 


XAJ...Old 


WPC...Enemy posting relief 


XAM...Rapid fire 


WPJ... .V 


XAP...Screw stakes 


WPL...Daily 


XAS...Defend 


WPN. ...Machine gun company 


XAV... (Null) 


WPO...Scouting 


XAW...Of 


WPR...Do not 


XAY....Unfavorable 


WPU...Unless 


XBA...Raid 


WPX...At once 


XBC...15 


WPY...Sector 


XBJ 




WSA... Probably 


XBL...Rest 


WSB...Soon 


XBN. ...Consider 


WSC...Duty 


XBO...To 


WSJ...Organize 


XBP...Essential 


WSM...Bavarian 


XBS...Until 


WSO...Enemy attack 


XBU...Signal 


WSP...Headquarters 


XBW...-es 


WSV...In 


XBY...To do 


WSX...70 


XFA...Front 


WSY...Not arrived 


XFB...E 


WUA...Hot 


XFC...Will not 


WUB...Defect 


XFJ. ...Regimental headquarters 


WUC...L 


XFM...Thing 


WUJ...Instantaneous 


XFO...4.2 


WUM...9.45 


XFP...His 


WUO...Men 


XFS...Village 


WUP...Your company 


XFV...Evacuate 


WUS... Interval 


XFW...Parallel 


WUX... Comma 


XFY...Figure 


WUY...Sight 


XGA...Has destroyed 


WXA...Using 


XGD...77 


WXB...Gassed 


XGF...One 


WXG...Believe 


XGK...In progress 


WXM...Railroad 


XGN...Critical 


WXO...Zero hour 


XGO... .-ou 


WXP...Flank 


XGP...Operation 


wxs...Will take place 


XGS... Comma 


wxv...85 


XGV... Or 


WXY... .W 


XGW...In front 


WYB...Signal 


XGY...Darkness 


WYF...Our artillery 


XJB... -ment 


WYK...Detonator 


XJC...Men gassed 


WYM...Making . 


XJG...45 



45 



XJM. ...20 


XUJ. ...Mass 


XJO. ...Make ready 


XUN. ...Sergeant 


XJP. ...Not 


XUO. ...Accidentally wounded 


XJS. ...Officer 


XUP. ...-sh 


XJU. ...Everywhere 


XUS. ...1 


XJW. ...Telegraph 


xuw. ...Shell 


XMA. ...Send 


XUY. ...Down 


XMC. ...Am not 


XWA. ...Number 


XMD. ...T 


XWB. ...Missing 


XMJ. ...Nest 


XWC. ...As 


XMO...Will signal by 


XWJ. ...Shall not 


XMP...Artillery 


XWM. ...Out 


XMS...Major 


XWO. ... (Null) 


XMU. ...Sub 


XWP...Shell fragment 


XMW...Quarter 


XWS...-ed 


XMY...65 


xwu...Panic 


XOB... (Null) 


XWY...0 


XOF. ...Have you received 


XYB...Further 


XOG... (Null) 


XYF...Service 


XOK...Machine gun nest 


XYG...Red rocket 


XOL... Squad 


XYM...18 


XON...Annoy 


XYP...Shall 


XOP...Gas attack 


XYS...Need 


XOS...Bombing post 


XYV... Comma 


XOV...In 


XYW...Lengthen 


xow...Party all in 


YAB... 's 


XOY... German 


YAC...Impossible 


XPA... .A 


YAK...Several 


XPB...Spot 


YAL... -dis 


XPC...Request 


YAM... .He 


XPJ... Enemy 


YAP...Quick 


XPL 




YAS...Comply 


XPN...Height 


YAV...Mine crater 


XPO...11 


YAW... .Shock 


XPR...Stretcher bearers needed 


YAX... .Battalion 


XPU...Falling 


YBA...Send out patrols 


XPW... .Sometime 


YBC... .Relieved 


XPY...Moving up 


YBJ... .Sent 


XSA...At once 


YBM....49 


XSC... .Open 


YBO... .See 


XSD...Send up 


YBP... . Shot 


XSG... .Station 


YBS... .Lieutenant 


XSK... .Seen 


YBV... .Sharpshooter 


XSM... .Telegraph 


YBW... .97 


XSO... .Arrive 


YBX... .Serious 


XSP... .Send 


YFA... . Send 


XSU... .September 


YFB... .Detect 


XSY... .Organize 


YFG...Sentry 


XUB... .Did 


YFJ... .Scout 


XUF... .House 


YFM... . Back 



46 



YFO ... Of 
YFP. . .-ous 
YFS. . .Personal 
YFV. . .Cable 
YFW. . .Poor 
YFX. . .Postponed 
YJA. ..Only 
YJB. . .All 
YJC. ..Raid 
YJM. . .Round 
YJO. . .Definite 
YJP. . .Runner 
YJS. . .Into 
YJV. . .Safe 
YJW. ..Artillery 
YJX. . .-Salient 
YMA . . . More 
YMB.. .-qu 

YMC. . .Satisfactory 
YM J . . . 3 
YMO. . .-ry 
YMP. . .Probable 
YMS. . .An 

YMV. . .Organization 
YMX. . .Sanitary 
YOB. . .Mortar 
YOC. . .Completely 
YOJ. . .In 
YOL. . .Hour 
YON. . .At 
YOP. . .Party 
YOU. . .Hear 
,Y0W. ..Pair 

YOX. . .Machine gun fire 
YPA . . . Rush 
YPB. . .Post 
YPF ... 33 
YPG. . .Period 
YPK. . .Our center 
YPL. . .Has 

YPM...0ur aeroplane 
YPO . . . A 
YPS . . . Our 
YPV.. .Operate 
YPW. . .Observe 
YPX. . .Dynamite 
YSA. . .Nothing 
YSB. . .Men 

YSC...Have not arrived 
YSJ. . .At point 
YSM.  .Joined 
YSO. .  .Notice 
YSP. .  .-ful 
YSV..  .Forcing 
YSX.  .O'clock 
YUB.  .Cloud 


YUC...Of our 


YUJ....Have lost 


YUM...Main 


YUP...Men killed 


YUS...Offensive 


YUW...On 


YUX... (Null) 


YWA...Attack 


YWC...Now 


YWJ. ...On account of 


YWM...On this 


YWO...Headquarters 


YWP...October 


YWS...Held 


YWU...20 


YWX...0 


YXA...-LI 


YXB...Loss 


YXG... .Centimeter (s) 


YXJ...Not 


YXM...Meaning 


YXO... (Null) 


YXP...Message 


YXV...May 


YXW...April 


YXZ.  . Mask 
ZAB.  .Make gas attack 
ZAF.  .Caisson 
ZAG.  .Completely 
ZAM.  .Center 
ZAP.  .Enemy trenches occupied 
ZAS.  .High explosive shells 
ZBA.  .64 
ZBC.  .Main trench 
ZBJ.  .Bomb-proof 
ZBP.  .In your 
ZBS.  .Falling back 
ZBW.  .11 
ZBX.  .How 
ZOB.  .Has 
ZOY.  .Arrived 
ZVA.  .General 
ZVB.  .Gas 
ZVC.  .Air