War varied alot depending on the region; in the Aryanised north, the style of warfare was fairly influenced by Iran. In the South, it would have been very different. Much of India is unhopsitable to horses, and this had a big impact on tactics; cavalry was important enough in the North by the EB period, but still lagging behind that of the rest of Eurasia. In the South, cavalry would have been nonexistent; even in later times, the Southern Indian states would be almost exclusively reliant on imported horses from Iran and Arabia (hence the strategic importance of Goa, the "horse port"). By the time the Marathas would rise to prominence (ca 1700CE), the Dekkan would have indigenous breeds of ponies, but not warhorses. But here I err. You would have two very distinct forms of warfare in the deep South and in the Aryanised Indo-Gangetic plain, possibly with some intermediary forms in the Dekkan between the Narmada and the Godaveri rivers.