Pulaski's efforts led to friction with the American officers, resulting in his resignation, but Congress authorized Pulaski to form his own independent corps in 1778. Pulaski's Legion consisted of dragoons, riflemen, grenadiers, and infantry. Another independent corps of dragoons joined Pulaski's in the Continental Line during 1778 when a former captain in Bland's Horse, "Light Horse Harry" Lee, formed Lee's Corps of Partisan Light Dragoons, which specialized in raiding and harassing supply lines. Colonel Charles Armand Tuffin, marquis de la Rouërie ("Col. Armand"), a French nobleman, raised a third corps of infantry in Boston, called the Free and Independent Chasseurs, which later added a troop of dragoons, becoming Armand's Legion. Although a reorganization in 1778 authorized expansion of the four regiments to 415 men each, forage difficulties, expiration of enlistments, desertions, and other problems made this impossible, and no regiment ever carried more than 200 men on its rolls, and they averaged 120 to 180 men between 1778 and 1780.