Which commander turned a group of american recruits into skilled soldiers?

The answer is: Baron Friedrich von Steuben

Explanation:

A Prussian military man hired by George Washington to whip the Continental Army into shape during the darkest days of the Revolutionary War,  von Steuben proved himself a heroic addition to the army. As Inspector General, he taught the army more efficient fighting techniques and helped instill the discipline they so sorely needed. It worked, and the drill manual he wrote for the army is still partially in use today.

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