The regiment, along with its Territorial units, raised 5 battalions during the war, all of which were either disbanded during the war or in its immediate aftermath.
- 5th (Home Defence) Battalion - formed in 1939.
- 6th Battalion - formed in July 1940 at Brecon. The Battalion transferred to the Royal Armoured Corps as the 158th Regiment in April 1942. It re-roled as an infantry regiment in March 1943. It saw service in the Far East.
- 30th Battalion - formed in 1941.
- The Brecknockshire Battalion - reformed in 1939 and transferred to the Royal Artillery in 1947.
- 4th Battalion, The Monmouthshire Regiment - formed in June 1939. It was redesignated as 1st Battalion South Wales Borderers in December 1942. The original 1st Battalion SWB had been disbanded in August 1942 in Cyprus, most of the unit having been taken prisoner or becoming casualties in North Africa
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