 After successes , particularly in 1792 and 1794 , in the northern theater of war ( Flanders Campaign ) , the right flank of the armies of the Center ( later the army of the Moselle ) , the army of the North and the army of the Ardennes were combined to form the Army of Sambre & Meuse . The remaining center and left flank of the Army of the Moselle and the Army of the Rhine were united , initially on 29 November 1794 , and formally on 20 April 1795 , under command of Pichegru . 
