An army often wins not through courage or luck, but by concentrating its own strength exactly at the decisive point, at the right place and moment.

Jomini studied Napoleon's campaigns and drew clear rules about where troops should be placed on a map. He insisted a general should always mass their main strength where it could strike decisively, instead of spreading it thin along the whole front. His rules were more geometric than Clausewitz's.

Why it matters His rules about concentrating force were taught to generations of officers in military academies.