The Action of 16 March 1917 was a naval engagement in which the British armed boarding steamer SS Dundee and HMS Achilles, a Warrior-class armoured cruiser, fought the German auxiliary cruiser SMS Leopard, which sank with the loss of all 319 hands and six men of a British boarding party. Laffert pressed on but Leopard was sunk, he was killed along with his crew and a British boarding party on 16 March, after a determined attempt to engage the British ships, when caught at a serious disadvantage.