In all fighting, the direct method may be used for joining battle, but
indirect methods will be needed in order to secure victory.
Chang Yü says: 徐發奇兵或擣其旁或擊其後 “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.[169]