Defeating a strong opponent with a very large number of disposable combatants. Usually used by the evil side, since their definition of "disposable" will stretch a lot farther.
As an Evil Overlord, it is important to choose your Evil Minions so that this does not apply to your troops, since it usually doesn't work against heroes.
The Trope Namer is the popular real-time strategy game Star Craft; [...] [tvtropes.org]