In ancient india who were responsible for fending off intruders?

In ancient India, the Kshatriyas were responsible for fending off intruders.

History has recorded that the Indian subcontinent was vulnerable to invasions and intrusions. According to the class system prevalent in ancient India, the 'Kshatriyas' (simply the warriors), were responsible for protecting the society from any intrusions and invasions.

They waged armies, collected taxes, looked after the governance and administration, run the judicial system, and fought for the protection of their lands and people from other classes.

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).