Matilda II
Variants of the Matilda II trialled or developed by the brigade included the "Frog" flame throwing tank, Matilda dozer and the bomb-throwing Matilda Hedgehog. The 2/5th Armoured Regiment also trialled a bulldozer variant of the Grant in 1945. The Frog and Matilda dozer were used in combat by the Armoured Squadron (Special Equipment) during the Borneo Campaign. The 2/4th Armoured Regiment was issued six Matilda Hedgehogs, but they did not arrive in Bougainville until after the end of the war. The 4th Armoured Brigade also trialled modifications to the Matilda II and Grant that sought to waterproof the tanks so they could travel through rivers and coastal waters. As well as trialling new tank variants, the Brigade developed an ammunition and fuel trailer, which could be towed by Matilda II tanks; these trailers were used in combat zones by the 2/4th and 2/9th Armoured Regiments.