Usually, the only time the British used the M10 and Achilles offensively was in support of Churchill tank units, which lacked the associated 17 pdr-armed tanks that Sherman and Cromwell tank units had. Achilles went ashore on D-Day, equipping units of the Royal Artillery and Royal Canadian Artillery in Armoured Division or Corps Anti-tank Regiments. A typical A/Tk Regiment would have 4 Batteries, 2 x Towed 17 Pdr Batteries, 1 x Achilles and 1 x M10 Battery. The M10 Battery was replaced by a second Achilles Battery as more vehicles became available. Perhaps the most successful action of the Achilles was conducted by B troop, 245th Battery, 62nd Anti-Tank Regiment, Royal Artillery attached to the Royal Hamilton Light Infantry during Operation "Charnwood". South of Buron, a counterattack by a mixed force of Panzer IV and Panther tanks of the 12th SS Panzer Regiment was defeated by Achilles and 17-pounder anti tank guns of 245th Battery, 62nd Anti-tank Regiment. Thirteen German tanks were destroyed in one of the most successful antitank engagements of the campaign, for the loss of four self-propelled guns and a further four damaged.