So, there are five situations in which victory can be predicted: those who know whether they can fight or not can win; those who know how to use more soldiers and fewer soldiers can win; those who work together as a whole army can win; He who is prepared to deal with an enemy who is negligent and slack will be victorious; his general who is capable of commanding but the king does not interfere will be victorious. These five points are the ways to foresee victory.
Sun Tzu's Art of War: Planning and Attack