Bernhard Erasmus von Deroy

Bernhard Erasmus von Deroy (11 December 1743 – 23 August 1812) from the Electorate of the Palatinate became a noted general officer in the army of Bavaria. His military career began shortly after the start of the Seven Years' War. During the French Revolutionary Wars he first served on the side of the Coalition against the French revolutionaries, then fought as an ally of the First French Empire during the Napoleonic Wars. Deroy and his colleague, Karl Philipp von Wrede, were dominant personalities in the Bavarian military during the era of Napoleon Bonaparte.

From a military family, Deroy entered the army as a junior officer at an early age. He rose in rank to become a general by the time the War of the First Coalition broke out. He defended his home city of Mannheim against the army of the First French Republic until its capture in 1795. In 1800, he again fought as an ally of Austria, leading a brigade of Bavarian troops in action. From the time Napoleon became the emperor of France, Bavaria became allied to France and Deroy capably led a division during the 1805, 1806–1807, 1809, and 1812 wars. He was mortally wounded in 1812 during Napoleon's campaign in Russia.