Occupy and Guerrilla Warfare

The game should allow players to "ocupy" an enemy territorio without conquering it. Only controlling that lands, and being able to abandon it by withdrawing troops, etc.

That would allow scenerios similar to France occupation, or use of neutral lands (specially islands) without being necessary to permanently taking it.

In the other way, the atacked player would be able to move militia (like insurgent) out of main roads, or by "alternative roads", while offensive players would be able to do the same only with commando.