vikatthamānaḥ kumatir
īśvarasyāpramāṇa-vit
rathenaikena govindaḿ
tiṣṭha tiṣṭhety athāhvayat
vikatthamanah -- boasting; ku-matih -- foolish; isvarasya -- of the Supreme Lord; apramana-vit -- not knowing the dimensions; rathena ekena -- with a single chariot; govindam -- to Lord Krishna; tishtha tishtha -- stand and fight; iti -- so saying; atha -- then; ahvayat -- he called.
It appears from these verses that though Rukmi set out with an entire military division, he personally rushed up to Lord Krishna to fight with Him.