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In page M4 Sherman:

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The 75 mm gun also had an effective canister round that functioned as a large shotgun. In the close fighting of the French bocage of Normandy, the U.S. Army's 2nd Armored Division tanks used Culin Hedgerow Cutters fitted to their tanks to push three tanks together through a hedgerow. The flank tanks would clear the back of the hedgerow on their side with canister rounds while the center tank would engage and suppress known or suspected enemy positions on the next hedgerow. This approach permitted surprisingly fast progress through the very tough and well-defended hedgerows in Normandy. Over 500 sets of these were fitted to US armored vehicles, and many fitted to various British tanks (where they were called "prongs").[citation needed]