Kautilya's Arthashastra 10.2.4

10.2.4

purastān nāyakaḥ, madhye kalatraṃ svāmī ca, pārśvayor aśvā bāhūtsāraḥ, cakrānteṣu hastinaḥ prasāravṛddhir vā, paścāt senāpatir yāyāt niviśeta //

In front the leader (náyaka); in the centre the harem and the master (the king); on the sides horses and bodyguards (báhútsára); at the extremity of the (marching) circular-array, elephants and the surplus army; on all sides the army habituated to forest-life; and other troops following the camp, the commissariat, the army of an ally, and his followers should select their own road: for armies who have secured suitable positions will prove superior in fight to those who are in bad positions.