Together with the Char D1 pre-series , they represented the only modern tanks in France .
The Army was naturally very interested in what lessons could be learned from them about future warfare , outlining the concept of a Char de Manoeuvre .
Together with the Char D1 pre-series , they represented the only modern tanks in France and the Army was naturally very interested in what lessons could be learned from them about future warfare , outlining the concept of a Char de Manoeuvre .