Stanisław Żółkiewski
The Polish army began by blockading the fortress. Because the Swedish army was getting relief from Reval, the Poles sent Stanisław Żółkiewski there. The defeat of the Swedes at the Battle of Reval on 30 June ended the Weissenstein defender's hopes of attaining further help. When their long-awaited regular infantry arrived in August, the Poles started to build siege works. The start of the operation was difficult, as the artillery was unable to break the powerful bastions.