Answer :
There are 3: 1 ratio for the attacker to succeed in the battle, his forces should be at least three times the force of the defender. This somewhat vague statement has resulted in numerous interpretations and discussions from historical and military science points of view.
The force ratio can be described as to be the enemy total combat power divided by the friendly total combat power. In the current method, the staff assigns combat power indices (potentials) to each unit. The indices are connect to a base unit of 1. Traditionally it is accepted that a defending force has a 3:1 advantage over an attacker. A defending force can hold off three times its own number of attackers.
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