During his insane-o one-man Marbo-style assault on the Chaos forces, Michael Wittman destroyed twenty-seven Traitor Guard tanks - the highest recorded tally of tanks killed in one day by one unit in the history of the world. In addition to single-handedly annihilating an entire battalion of Heretics, Wittman also took out a large number of armored troop transports, half-tracks and supply carriers. For his balls-out assault, Wittman received the Order of Ollanius Pius and was hailed as a hero throughout the Imperium. High Command offered to give Wittman a chance to retire and work on Armageddon as a tank instructor but Wittman refused, stating that his duty was to engage the enemy. He had asses to kick, goddamnit. He returned to the front almost immediately, and on 8 August 944 he was killed in action when he was fired on simultaneously by eight million different Heretic and Chaos Legion tanks, anti-tank guns, Missiles, bomber aircraft and nerf rocket launchers. His tank was obliterated to the point where his remains weren't found until like two years after the war ended or something.
Michael Wittman was perhaps the greatest and most daring tank commander the Imperium has ever seen. During his career, he recorded 138 tank kills, 132 anti-tank gun kills, and destroyed hundreds of trucks, carriers, artillery, and errant sportscars. There's even a report that he fired his tank gun at a Chaos Battleship once, probably just to be awesome. The guy was completely balls-out, afraid of nothing, and capable of killing anything with wheels and/or tracks. He was an accomplished commander, a skilled tactician, and a worthy adversary for Chaos forces on all sides of the Imperium.