 While the 417th and 418th batteries remained with the 105th (Bedfordshire Yeomanry) Field Regiment, RA, the 419th and 420th batteries were transferred to the newly formed 148th (Bedfordshire Yeomanry) Field Regiment, RA.105th (Bedfordshire Yeomanry) Field Regiment, RA was converted to 52nd (Bedfordshire Yeomanry) Heavy Regiment, RA on 1 November 1939.It fought with the BEF but was disbanded after evacuation from Dunkirk on 20 June 1940.