Formerly part of Frederick the Great's staff, the Prussian general was recommended by Ben Franklin to George Washington. Accepted by the Continental Congress, Steuben joined Washington at Valley Forge, and began training the army. Appointed major general and inspector general in May 1777, he aided in the Battle of Monmouth, then spent two years writing the Regulations for the Order and Discipline of the Troops of the United States, an army training manual. Sent to Virginia in 1780 to oppose Benedict Arnold's actions, illness caused him to turn over his troops to Lafayette, but Steuben recovered in time to aid in the siege of Yorktown.