ge 181
Once designated not changed unless ordered 182

Oblique deployment as skirmishers 245

Oblique march 162-163

Observation 200-201

Observation of target and fire 428-429

OBSTACLES:
Abatis 1176
Against cavalry 1180
Automatic alarms 1192
Barricades 1185
Cheveaux de frise 1179; 1189
Fraise 1178
Guarding obstacles 1190
In front of outguards 1187
Inundations 1186
Kinds 1176
Lessons from European War 1188
Listening posts 1191
Location 1175
Military pits 1184
Necessity for 1174
Object 1173
Palisade 1177
Search lights 1193
Trous de loup 1184
Wire entanglements 1181; 1182; 1188
Wire fence 1183

Obstacles located by Major 358

Occupation of ground 1426

Offensive necessary for decisive results 367

Office, how to enter 1527

Officer of the Day 1593

OFFICERS:
Posts of 71
To be true leaders 377
To comply with spirit of ord