Battalion commander took charge of the applied infantry tactics course in 1884. Working mainly on the
Battle of Gravelotte, he highlighted the moral factor and deduced principles of action (surprise by concentration of resources, massive artillery action, use of cavalry for shock and pursuit) and a tactical doctrine (slow and progressive wear and tear of the enemy with
economy of force to concentrate them at the breaking point). His course became the main course of the school. Battalion commander took charge of the course in military history, strategy and general tactics in 1892. Basing his course on the study of the
Battle of Wörth and the
Napoleonic Wars, he retained three principles: freedom of action, ability to impose his will on the enemy, economy of force. Bonnal thought he detected in
Napoleon a system, that of the
avant-garde (
Vanguard), which he still considered valid. Together, they designed the first
wargame exercises similar to the German
Kriegsspiel. ==Foch==