The French gun line behind the front was lightly manned, but the remaining guns fired frequently, so the Germans did not detect its weakness from rate of firing, although aerial observers did spot a concentration of field guns behind the main line of resistance.
The French gun line behind the front was lightly manned. The remaining guns fired frequently. The Germans did not detect its weakness from rate of firing. Aerial observers did spot a concentration of field guns behind the main line of resistance.