The 11th, 12th and 13th were raised in August 1914 in Edinburgh, with the 11th and 12th allocated to 9th (Scottish) Division and the 13th to 15th (Scottish) Division, and moved to France in mid-1915. They first saw action at the Battle of Loos, where the 11th was almost wiped out, and spent the remainder of the war on the Western Front. The 11th and 12th moved to Germany after the armistice; the 12th was reduced to a cadre in April 1919 and disbanded in the UK in June, whilst the 11th was reduced to a cadre and disbanded at Cologne in November. The 13th remained in Belgium, being reduced to a cadre in March 1919 and disbanded in the UK in June.