For the Rhine crossing, the British 21st Army Group had some 600 Buffalos available, most of them used to transport the assault infantry. As mud was expected to hamper the Sherman DD tanks, some LVTs were armed with a 20 mm cannon and two machine guns to give fire support until bridges could be constructed across the river. The "Specials" were assigned to the 79th Armoured Division (which operated all specialist assault vehicles), that also provided Buffalos fitted with "Bobbin" carpets to create temporary roadways over the mud.