It is said that ancient Indians had certain ethics in war. Fighting can only be done between dawn and dusk. So, a pre-dawn surprise attack is technically wrong in their book. Their code of conduct also dictates that a warrior of a certain stature could only engage in combat with someone of the enemy of a similar calibre. That is a foot soldier duels with another foot soldier, a warrior on the elephant battalion with another one on an elephant and so on. The commander does not watch the battle on the sidelines but gets his hands dirty by being in the thick of things. By convention, come dusk, both warring factions would lay down their arms and continue in natural light the following sunrise. The Kurukshetra War (circa 3000 BCE, dates debated) is said to have ended all the codes of war. When cousins and uncles go for each other's carotids, niceties are expectedly put aside. As the cyclical nature of time was pushing to Kaliyuga, anarchy is what one just expects. With battles sometime...
It is all Mimesis