The British War Medal (left) was awarded to British and Imperial forces personnel who served between August 5th, 1914, and November 11th, 1918, or in later campaigns until 1920. To qualify, a recipient needed to have entered a theatre of operations or serve overseas for at least 28 days. 

These medals are engraved on the edge: 'GS-35862 PTE.C.MARTIN. R.FUS.'