The Importance of Knowing the Probability of a Battle

In modern war the impressions are much more powerful usually we fight against an enemy we cannot see the machine rules the battlefield. We no longer fight in great masses but in small groups often as individuals therefore the psychological reaction of the individual has become increasingly important so again if you've got all your people mustard together it's a little easier to overcome whatever psychological barriers they might have when they start getting spread out. The knowledge of men is especially difficult for two reasons first because it cannot be learned from books and also he says moreover the psychological impressions of battle were simpler rifle and cannon ruled the battlefield  and the enemy could be seen in modern war.