40th Infantry Division (United Kingdom)

40th Division
Insignia showing a bantam.
Active	1915–1918 1943–1944 1949–?
Country	United Kingdom
Branch	British Army
Type	Infantry
Size	Division
Commanders
Notable commanders	Major-General H.G. Ruggles-Brise

The 40th Division was an infantry division of the British Army active during World War I, where it served on the Western Front. It was a division of Lord Kitchener's New Army volunteers, mostly "bantam" recruits of below regulation height. It was later briefly reformed as a fictional deception formation in World War II, and during the early years of the Cold War was recreated a third time to garrison Hong Kong.

The 40th Division was originally formed as a Kitchener's Army 'Bantam' division between September and December 1915 for service in the First World War. 'Bantam' personnel were those who were under the Army regulation height but otherwise fit for service. It comprised the 119th, 120th, and 121st Brigades. The 40th Division moved to the Western Front in June 1916 and served there throughout the First World War.

The most notable action of the division may be its participation in the Battle of Cambrai in late 1917. By 22 November the British were left exposed in a salient on the battlefield. Field Marshal Sir Douglas Haig, Commander-in-Chief (C-in-C) of the British Expeditionary Force (BEF) on the Western Front, wanted Bourlon Ridge and the exhausted 62nd (2nd West Riding) Division was replaced by the 40th Division, commanded by Major-General John Ponsonby, on 23 November. Supported by almost a hundred tanks and 430 guns, the 40th attacked into the woods of Bourlon Ridge on the morning of the 23rd. They made little progress. The Germans had put two divisions of Gruppe Arras on the ridge with another two in reserve and Gruppe Caudry was reinforced. The 40th Division reached the crest of the ridge but were held there and suffered over 4,000 casualties for their efforts in three days. The division was subsequently driven back in the German counterattacks, suffering many more losses.