 They were replaced in the brigade by the 4th Battalion, Dorset Regiment, originally from the 129th (South Western) Infantry Brigade.The brigade, shortly afterwards, was redesignated the 128th Infantry Brigade.In the spring and summer of 1939 the Territorial Army was doubled in size and all units were ordered to form a duplicate unit and the 4th Battalion was split in two, to create the 1/4th and 2/4th battalions and 5th/7th Battalion was split into the 5th and 7th battalions.