If the gun barrel extends past the front of the hull I guess it would hit the rock wall before the rest of the tank and be damaged or destroyed before the round was fired. The round might explode in the breach, explode in the barrel or the gun may have been rendered incapable of firing. The first two events would obviously be highly detrimental to the tank's crew, especially the commander, gunner and probably loader.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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