यदा वा पश्येत्मित्रमाक्रन्दश्च मे शूरवृद्धानुरक्तप्रकृतिः विपरीतप्रकृतिः परः पार्ष्णिग्राहश्चासारश्च शक्ष्यामि मित्रेणासारमाक्रन्देन पार्ष्णिग्राहं वा विगृह्य यातुमिति तदा विगृह्य यायात् ॥ कZ_०७.४.१६ ॥
yadā vā paśyet mitram ākrandaś ca me śūravṛddhānuraktaprakṛtiḥ viparītaprakṛtiḥ paraḥ pārṣṇigrāhaś cāsāraś ca śakṣyāmi mitreṇāsāram ākrandena pārṣṇigrāhaṃ vā vigṛhya yātum iti tadā vigṛhya yāyāt
或者,当他看到自己的盟友与后方支援国忠诚可靠,其诸要素勇敢而老练,而敌方诸要素则不利;并且当敌方的“抓踵者”(威胁其后方的邻国)及其弱盟友都显得脆弱——以致他可凭盟友打击敌方的弱盟友,或凭后方支援打击“抓踵者”——那么他就应发动敌对行动并进军。
March when your support system (ally + rear base) is reliable, and the enemy’s support system (weak ally + rear threat) can be neutralized through coordinated action.
Because an expedition fails if the rear is threatened; neutralizing or containing the heel-grasper is a prerequisite to sustained operations.