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.