What was the prussian army officer who helped George Washington train his army at Valley Forge?

The Prussian army officer who helped George Washington train his army at Valley Forge was Baron Friedrich Wilhelm von Steuben. Arriving in 1778, he implemented a rigorous training program that significantly improved the discipline and effectiveness of the Continental Army. His methods included standardized drills and the introduction of a more organized structure, which greatly enhanced the army's performance in subsequent battles. Von Steuben's contributions were crucial to the eventual success of the American forces in the Revolutionary War.