As with the rest of the British Army the AOD/AOC was transformed by the First World War. Both the sheer scale of the war and the increasing technical complexity created an organisational structure that, in its outlines, survives until today. The depots at Woolwich, Weedon and Pimlico were supplemented by the wholesale takeover of warehouses throughout the country and in early 1915 a depot was established at Didcot to be the major focus for the receipt and distribution of RAOC stores. Ammunition storage was also expanded dramatically and the former peacetime magazines at places such as Portsmouth and Plymouth were supplemented by purpose built depots at Bramley, Altrincham, Credenhill and Didcot. On the Western Front a highly successful logistic infrastructure, largely rail based, was created to support the front. Parallel systems, but of less complexity, supported operations in Italy. Other expeditions such as Gallipoli/Salonika, Palestine and Mesopotamia brought supply challenges and a large logistic bases were established on the Egyptian Canal Zone and Basra.