Kautilya's Arthashastra 7.10.9

7.10.9

calāmitrādbhūmilābhe śakyasāmantato viśeṣaḥ //

As to the acquisition of land from a wandering enemy, there is the difference of having a powerful or powerless enemy close to the acquired territory; for the land which is close to a powerless enemy is easily maintained while that bordering upon the territory of a powerful enemy has to be kept at the expense of men and money.