The Provost Corps in the Continental Army consisted of one mounted troop. However, the troop performed the duties of military police rather than of cavalry. They were the forerunners of the US Military Police Corps. Among them was Von Heer’s Provost Troop (the Marechaussee Corps), commanded by Captain Bartholomew Von Heer (June 1, 1778; Brevet Major, September 30, 1783; served to close of war).
Source(s): http://en.wikipedia.org/wiki/List_of_Continental_Army_units_(1777–1784)