Gopa (caste)
Before the war started in the Kurukshetra battlefield in Mahabharat (one of the two major epics of ancient India), both sides – the Kauravas and the Pandavas started out in all directions to meet various kings to solicit support. Incidentally, both Duryodhana (from Kauravas side) and Arjuna (from Pandavas side) reached Dwarika, the kingdom of Shree Krishna together. Lord Krishna put forward a condition in front of both – you can have either me on your side or my entire army, the Yadav army – known as the Narayani Sena. He also told both that he wouldn't take to any arms during the entire war. So when Krishna first asked Arjun what he wanted, much to Duryodhana's delight, he opted for the Lord- 'Narayan' and Duryodhana got these great warriors of the strong army-the Narayani Sena.  When Narayani Sena was fighting for Kauravas, only Kritavarma and his army unit fought for the Kauravas. Satyaki fought for the Pandavas. The rest of the Atirathas and Maharathis were withheld from the Kurukshetra war on the advice of Balram and Krishna.