The following year Władysław took part in the second phase of the Polish–Ottoman War, a consequence of the long series of struggles between Poland and the Ottomans over Moldavia. In 1621 Władysław was one of the Polish commanders at the Battle of Chocim; reportedly he was struck ill, but despite that he proved a voice of reason, convincing other Polish commanders there to stay and fight. His advice was correct, and the battle eventually ended with a peace treaty that returned the status quo from before the Ottoman invasion. This peace treaty also gave Władysław an international reputation as a "defender of Christian faith", and increased his popularity in the Commonwealth itself.