During the war he served at the War Office between 1939 and 1941 and commanded the 6th Royal Tank Regiment from 1942 until 1944. In 1945 he was appointed commander of the 25th Armoured Engineer Brigade Royal Engineers. Between 1949 and 1950 he served as commander of the 8th Royal Tank Regiment and, between 1953 and 1956, as commander of the 23rd Armoured Brigade, during which he attended the Imperial Defence College in 1955. From 1956 until 1958 he served as chief of staff to the British Joint Services Mission in Washington, D.C. Liardet retired from the army in 1964. He died in 1996 at the age of 89.http://www.kingscollections.org/_assets/components/archiospdfbuilder/?docid=1877
