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HESH

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High Explosive Squash Head

A type of projectile developed by Dennis Burney in WW2 as a "wall buster" for use against concrete pillboxes and the like. The HESH projectile is usually a very thin-walled shell filled with plastic high explosive.

The shell is fired at the wall, where the explosive spreads out like a cow pat onto the surface. The explosive then detonates, creating extreme stresses in the wall which cause a scab to fly off the far side causing grief for anyone in the room.

It didn't take long for folk to realise that if it has that effect on concrete, it has a similar effect on metal, and it began to be used as an AP projectile. British guns that used HESH include:

Due to the increasing use of anti-spall liners on armour, HESH has become less effective.