With the arrival of Rawlings' regiment, Western Department commander Col. Daniel Brodhead now led a force of largely frontier raised men experienced in Indian-style woodlands warfare. In his most notable tactical achievement, Brodhead headed a campaign of about 600 of his Continental regulars, which included the Maryland and Virginia Rifle Regiment, local militia, and volunteers to the upper waters of the Allegheny River in August and September 1779, where they destroyed the villages and crops of hostile Mingo and Munsee Indians. Brodhead's expedition was part of Washington's wide-ranging, coordinated offensive of the summer of 1779 that also included the larger, concurrent Sullivan Campaign led by Maj. Gen. John Sullivan and Brig. Gen. James Clinton against enemy Iroquois and Loyalist units in southern and western New York State. From mid-1779 until late 1780, however, the Maryland and Virginia Rifle Regiment was primarily deployed in detachments to support line infantry contingents at several of the frontier outposts in the general vicinity of Fort Pitt, including Fort Laurens, Fort McIntosh, and Fort Henry (Wheeling) in what is now eastern Ohio, western Pennsylvania, and northernmost West Virginia, respectively. Change in command of the regiment occurred for the third time in late 1780. Under continual pressure to maintain sufficient troop strength in the unit, regimental commander Capt. Thomas Beall ran afoul of army regulations and Western Department commander Brodhead by approving the enlistment of a British prisoner of war in February 1780. Beall tried to rectify his lapse in judgment by discharging the recruit, although after he had already been given his recruitment bounty and service clothes. On August 14, 1780, at Fort Pitt, Captain Beall was tried by court-martial, found guilty of "discharging a Soldier after having been duly inlisted and receiving his regimental cloathing through private and interested views thereby defrauding the United States," and on October 13, was dismissed from the service. Adamson Tannehill succeeded Beall as commander of the regiment for the remaining few months of the unit's existence. On November 1, 1780, Washington issued orders approved by Congress that specified plans for the comprehensive reorganization of the Continental Army effective January 1, 1781. All Additional and Extra Continental regiments, such as the Maryland and Virginia Rifle Regiment, that had not been annexed to a state line organization were disbanded by that date. The much-diminished unit comprised only 2officers and 50 enlisted men in late December 1780.