Kautilya's Arthashastra 9.2.16

9.2.16

jānapadam ekārthopagataṃ tulyasaṃgharṣāmarṣasiddhilābhaṃ ca śreṇībalaṃ mitrabalāt śreyaḥ //

That corporation of soldiers which is native, which has the same end in view (as the king), and which is actuated with similar feelings of rivalry, anger, and expectation of success and gain, is better than the army of a friend. Even that corporation of soldiers which is further removed in place and time is, in virtue of its having the same end in view, better than the army of a friend.