When you read a number of the Red Cross Files for the 1st Battalion A.I.F. soldiers killed during the November 5th 1916 battle there is a reference to "A big cross was put up with their names on it."
Taken from one of the Red Cross Files
Taken from a letter from the Red Cross to the family of Henry Lanser, 2nd LT
Since finding this reference in the Red Cross Files, I have come across a photograph of an example of the kind of 'single cross' erected for multiple soldiers on the battlefield - see the photograph below.
Photograph source: Outdoor portrait of 2600 Corporal George Smith Holliday, C Company, 35th Battalion, at the ... | Australian War Memorial (awm.gov.au)
Bayonet Trench Cemetery
This photograph (below) is an example of what was placed at a battlefield cemetery. All the men included on this were buried in the Bayonet Trench Cemetery.
Provided by: Penny Ferguson
Individual Graves
An example of the crosses placed on the soldier's graves on the battlefield are shown in the photograph below. It shows the crosses for the initial burial (the small wood ones) and the later crosses (large white ones) that are placed for 2nd Lieutenant Arthur Valentine Steel and 2nd Lieutenant Henry Miller Lanser (Both of the 1st Battalion A.I.F. and both killed during the November 5th 1916 battle).
Provided by: Penny Ferguson