balir mahendraṁ daśabhis
tribhir airāvataṁ śaraiḥ
caturbhiś caturo vāhān
ekenāroham ārcchayat
baliḥ - Mahārāja Bali; mahā-indram - the King of heaven; daśabhiḥ - with ten; tribhiḥ - with three; airāvatam - Airāvata, carrying Indra; śaraiḥ - by arrows; caturbhiḥ - by four arrows; caturaḥ - the four; vāhān - mounted soldiers; ekena - by one; āroham - the driver of the elephants; ārcchayat - attacked.
The word vāhān refers to the soldiers on horseback who protected the legs of the carrier elephants. According to the system of military arrangement, the legs of the elephant bearing the commander were also protected.