 Developed under the supervision of Major-General Percy Hobart, these were specially modified M4 Sherman and Churchill tanks.Examples include the Sherman Crab tank (equipped with a mine flail), the Churchill Crocodile (a flame-throwing tank), and the Armoured Ramp Carrier, which other tanks could use as a bridge to scale sea-walls or to overcome other obstacles.In some areas, the beaches consisted of a soft clay that could not support the weight of tanks.