Kautilya's Arthashastra 7.13.2

7.13.2

śaktisampanno hy amitram ucchidya pārṣṇigrāham ucchindyāt, na hīnaśaktir alabdhalābhaḥ //

WHEN the conqueror and his enemy simultaneously proceeded to capture the rear of their respective enemies who are engaged in an attack against others, he who captures the rear of one who is possessed of vast resources gains more advantages (atisandhatte); for one who is possessed of vast resources has to put down the rear-enemy only after doing away with one's frontal enemy already attacked, but not one who is poor in resources and who has not realised the desired profits.