The 2/5th (Derbyshire) Battalion was formed as a 2nd-Line duplicate of the 1/5th Battalion, raised in 1939 when the TA was doubled in size. It was renamed the 5th Battalion after the loss of the 1/5th in Malaya in February 1942. It served in the 139th Infantry Brigade, part of the 46th Infantry Division, in France ("see 9th Battalion"), Tunisia, Italy and Greece.