20 Aug 1914 Special Reserve Lieutenant RAMC.
19 Sept 1914 Mobilised.
1 Apr 1915 Captain RAMC.
1914–1918 Served with the BEF France.
16 Aug 1917 Awarded the Military Cross for conspicuous gallantry and devotion to duty. Captain William Fotheringham, finding no suitable position for an aid post in the captured lines, established one in an open trench, where he attended to the wounded for four days and nights under constant shell and gas shell attack. His courage and devotion set a fine example to all those working under him.
18 July 1918 Awarded a bar to his Military Cross for conspicuous gallantry and devotion to duty. Captain William Fotheringham, MC, RAMC (SR), attended to the wounded in an exposed position under heavy hostile gas shell fire. Though suffering badly from gas he continued at work with the greatest courage and determination until he was blinded by gas.
1 Aug 1919 Permanent Regular Army Commission Captain RAMC.
Malta 18 Sept 1919 Arrived from England.
Malta 1920 On duty at Mtarfa hospital which was taken over by the RAMC on 23 June 1920. While at Malta he represented the Corps at Golf.
Malta 25 July 1921 To England on sick leave.
Malta 29 Nov 1921 Returned from England.
Malta 20 Sept 1922 Left for Constantinople.
1922–1923 Served at Constantinople.
16 June 1923 Retired.