On 23 August, one company (B) was assigned to the 2nd Infantry Division, fighting in the Battle for Brest; it was released on 19 September. Meanwhile, the remainder of the battalion was employed fighting on the Crozon Peninsula to the south of the port through September. A shortage of the M18 Hellcat in the supply chain – most battalions in France were equipped with M10s at the time – led to the battalion being assigned a number of M4A3 Shermans, which carried the same 76mm gun, as temporary replacements.