Kautilya's Arthashastra 8.5.23

8.5.23

vikrītam abhiyuñjāne saṃgrāme vāpavartinā //
dvaidhībhāvena vāmitraṃ yāsyatā vānyam anyataḥ /

A friend who is bought by another and who has withdrawn himself from fighting;

A friend who, following the policy of making peace with one and marching against another, has contracted friendship with one, who is going to march either singly or in combination with others against an ally;