Nurlu, [61], [62], [94]

Oise River, [3], [5], [80]

Oldham, General, [244]

Onions, Corporal, V.C., [123]

Oppy, [141], [276], [287]

Orr-Ewing, General, [16]

Ors, [194], [195], [200], [201]

O'Ryan, General (U.S. Army), [151]

Ostend, [289], [290]

Ovillers, [85]