The regiment was mobilised on the outbreak of war on 3 September 1939 as part of
21st Army Tank Brigade, composed of three TA battalions of the Royal Tank Regiment. The unit formed part of
1st Army Tank Brigade in 1941–42, serving with it in the
Western Desert Campaign including the
Second Battle of El Alamein. For the
invasion of Northern Europe in 1944, it was equipped with
Canal Defence Light Grant tanks. These were not used in battle. == Postwar ==