paundrakah -- Paundraka; api -- and; tat -- His; udyogam -- preparations; upalabhya -- noticing; maha-rathah -- the mighty warrior; akshauhinibhyam -- by two full military divisions; samyuktah -- joined; niscakrama -- went out; purat -- from the city; drutam -- quickly.

Upon observing Lord Krishna's preparations for battle, the mighty warrior Paundraka quickly went out of the city with two full military divisions.