The 73rd Brigade was originally raised during the First World War in September 1914 from men volunteering for Lord Kitchener's New Armies, and was assigned to the 24th Division.
The brigade consisted of battalions from the East of England and spent the early months of its existence training.
The brigade had suffered extremely heavy casualties during the war and was disbanded in late March 1919.
[2] The brigade initially consisted of infantry battalions raised for hostilities-only and, aside from a few Regular and Territorial soldiers, was composed almost entirely of conscripts and wartime volunteers.
In December 1942 the battalions were posted elsewhere and the brigade ceased to be an operational formation, although the headquarters remained in existence until 19 July 1943, when it was finally disbanded.