XI Corps was a corps-sized formation of the British Expeditionary Force, active during the First World War that served on the Western Front and in Italy. It was recreated as part of Home Forces defending the United Kingdom during the Second World War.

First World War

Western Front

XI Corps was formed in France on 29 August 1915 under Lt-Gen Richard Haking. Its first serious engagement (as part of Sir Charles Monro's First Army) was the Battle of Fromelles (19 July 1916), a diversion to the Somme offensive in which two untried divisions were launched into an ill-planned subsidiary attack in Flanders. It achieved nothing but cost thousands of casualties, and caused great resentment in Australia. General Officer Commanding Lt-Gen R. Haking

Italian Front

XI Corps was one of two corps HQs moved to the Italian Front in November 1917. GOC Lt-Gen Sir Richard Haking Corps Troops:

Return to the Western Front

XI Corps returned to the Western Front in March 1918 in time to take part in the defence against the German spring offensive (the Battle of the Lys) and the final battles of the war as part of Sir William Birdwood's Fifth Army.

Order of Battle 27 September 1918

Corps Headquarters Command Staff

Divisions attached to XI Corps

Second World War

XI Corps was reformed in the United Kingdom early in the Second World War. It was based at Bishop's Stortford in Hertfordshire with a major operational base at Felsted School.

General Officers Commanding

Commanders included:

External sources