During World War II, British forces researched ways to
improve upon the previous mine-flail design created by South
African Major A.S.J. du Toit. This South African mine flail
system was used to purposefully detonate mines with long,
heavy chains that were mounted on the hulls of existing tanks.
Engineers in Britain fine-tuned the mine flail design into a new
system named the Crab, which utilized around forty-three
individual strands of chain. The American M4 Sherman
medium tank was widely used with the Crab design. This model
was produced by the thousands, and although its offensive
capabilities were not explored, it served its purpose by allowing
the allies to handle mine fields before battles truly commenced.
The Sherman Crab tank became the most utilized mine-flail
tank of World War II.