At the beginning of each part, five balloons (green) are scattered on the map. They are neutral.
The capture of a balloon makes it taking the color of the army.
A camp having captured all the balloons and holding them throughout one 24h as since the catch of the last of them, is victorious .
The strategic prospect here is guessed that there is to take and hold the balloons. The army/company/section which takes a balloon will have to put all works about it (stronghlods, etc.) to prevent an other army to take it back.