When I fight in the battle field the steeds that are yoked to my car are white and golden hued and hence they call me Shvetavahana.
श्वेताः काञ्चनसंनाहा रथे युज्यन्ति मे हयाः। संग्रामे युध्यमानस्य तेनाहं श्वेतवाहनः॥