The British army was mainly a small professional army with a large number of volunteers (Territorials). It was fully mechanised and well equipped. The total strength in 1939 was 227,000 and these were formed into 64 Line Infantry Regiments, five regiments of Infantry of the Guard, 22 Regiments of Cavalry (including Two Regiments of Household Cavalry), the Royal Tank Regiment and the Royal Artillery.
The Territorial Army amounted to 428.000 men. This total was also augmented by troops from Australia, Canada, India, New Zealand, South Africa and many other commonwealth nations.