Margus.
Fought May, 285, between the legions of the Emperor Carinus and those of Diocletian, who had been raised to the purple by his soldiers. The troops of Diocletian, wasted by the Persian War, were all but overpowered by the fresher legions of Carinus, but the defection during the battle of one of his generals turned the scale, and Carinus himself being killed by an officer whom he had wronged, Diocletian gained a complete victory.
Maria Zell (Campaign of the Danube).
Fought November 8, 1805, during the French advance on Vienna, between Davoust's corps, and the Austrian corps, under General von Meerfeld. The Austrians were defeated and driven off in disorder, leaving 4,000 prisoners in the hands of the French.
Mariendahl (Thirty Years' War).
Fought May 2, 1645, between the French, under Turenne, and the Imperialists, under Merci. Turenne, who had 3,000 infantry and 8 regiments of horse, was surprised in his camp by Merci at 2 a.m., and being placed between two fires, was compelled to beat a disastrous retreat, with the loss of almost all his infantry, 1,200 cavalry, and all his artillery and baggage.
Marignano (Italian Wars).
Fought September 13 and 14, 1575, between 50,000 French, under Francis I, and about 40,000 Swiss mercenaries. The Swiss attacked the French camp, and forcing the lines, fought till midnight without decisive result. On the morning of the 14th the battle was renewed, and the Swiss were on the point of success, when the arrival of a small force of Venetians obliged them to withdraw. The French lost 6,000 men, and the Swiss losses were very heavy, including 1,200 who perished in the flames of a village they were defending after the repulse of the attack. Marshal Trivulzio, who commanded a wing of the French army, called the action the "Battle of Giants."
Marosch, The (Conquest of Dacia).
Fought 101, between the Dacians, under Decebalus, and the Romans, under Trajan. The Dacians were utterly routed, and driven across the river with heavy loss.