Two cavalrymen with two infantrymen in landscape

One of a collection of 30 original unsigned ink and wash drawings (by Reinhold) with minute pencil titles, being of staff, cavalry and infantry uniform figures and groups, many with backgrounds of Potsdam (and other?) buildings. Two figures on horseback facing right, plus two standing figures at center with backs to each other. One of a collection of 30 original unsigned ink and wash drawings (by Reinhold) with minute pencil titles, being of staff, cavalry and infantry uniform figures and groups, many with backgrounds of Potsdam (and other?) buildings. Two figures on horseback facing right, plus two standing figures at center with backs to each other. Unbound; in red cloth and board case, no title; clean. Paris, Ordonneau sale, 1970.