failed to explode. In the end, he was shot and heroically sacrificed". When tanks overran entrenchments, hand grenades could be, and were, used by infantry as improvised anti-tank mines by placing or throwing them in the path of a tank in the hope of disabling a track. While this method was used in desperation, it usually proved more dangerous to the soldier on the ground than to the crew of the tank. Chinese troops in the Second Sino-Japanese War used suicide bombing against Japanese tanks. Chinese troops strapped explosives like grenade packs or dynamite to their bodies and threw themselves under Japanese tanks to blow them up. This tactic was used during the Battle of Shanghai, where a Chinese suicide bomber stopped a Japanese tank column by exploding himself beneath the lead tank, and at the Battle of Taierzhuang where dynamite and grenades were strapped on by Chinese troops who rushed at Japanese tanks and blew themselves up. During one incident at Taierzhuang, Chinese suicide bombers obliterated four Japanese tanks with grenade bundles. Purpose-designed anti-tank grenades generally use the shaped charge principle to penetrate tank armor, although the high-explosive squash head (HESH) concept is also used. In military terminology, warheads employing shaped charges are called high-explosive anti-tank (HEAT) warheads. Because of the way shaped charges function, the grenade must hit the vehicle at an exact right angle for the effect to work most efficiently. The grenade design may ensure this by deploying a small drogue parachute or fabric streamers after being thrown, or improvised stabilisation fins if dropped from a drone. Britain put the first purpose-built anti-tank grenade into the field during the Second World War in late 1940 with the No 68 AT Grenade, which was one of the first "any" type anti-tank weapons of the shape charge or HEAT type. The No 68 was fired from a rifle using the Mills grenade cup launcher. The Type 68 had a penetration of 50 mm of armor plating, which was astonishing for 1940. Also developed by the UK during the war was the No 74 ST Grenade, popularly known as the "sticky bomb", in which the main charge was held in a glass sphere covered in adhesive. In anticipation of a German invasion, the British Army asked for ideas for a simple, easy to use, ready for production and cheap close-in antitank weapon. The ST Grenade was a government sponsored