English: Empty grenade canisters, Western Front, during World War I. Piles of empty, used grenade canisters and a few German helmets. The long handled grenades in the background were the type used in the early years of the war. The cans in the foreground may be some of the No. 8 grenades which were literally made from food tins.

Many of these early types of grenade were quite dangerous to the person throwing them. Later types, such as the very effective Mills grenade, were safer. Over 61 million grenades were used; they were a popular weapon as they required little skill or training.
[Original reads: 'A few of our empties.']

http://digital.nls.uk/74549390