It is the rule in war, if ten times the enemy’s strength, surround them; if five times, attack them; if double, engage them; if equal, be able to divide them; if fewer, be able to evade them; if weaker, be able to avoid them.

Sun-Tzu (fl. 6th C. AD) Chinese general and philosopher [a.k.a. Sun Wu]

The Art of War, ch. 3