Kautilya's Arthashastra 7.6.35

7.6.35

vikramayed bhartari vā siddhaṃ vā daṇḍacāriṇam //
kuryād amitrāṭavīṣu pratyante vānyataḥ kṣipet //

Or, he may be set against the enemy or may be employed as a captain of an army to guard wild tracts against enemies, or thrown somewhere on the boundary.