5. Energy
5
In all fighting, the direct method may be used for joining battle, but indirect methods will be needed in order to secure victory.
Chang Yu says: "Steadily develop indirect tactics, either by pounding the enemy's flanks or falling on his rear." A brilliant example of "indirect tactics" which decided the fortunes of a campaign was Lord Roberts' night march round the Peiwar Kotal in the second Afghan war.[1="Forty-one Years in India," chapter 46.]