The Danubian defeat, delivered at the Battle of Bielsko, prompted the King of Prussia to intervene, due to concerns about Russian Hegemony over Eastern Europe, and the aggressive nature of the advancing armies. Fredrick William IV, provided nearly 150,000 soldiers to confront the Imperial Army on the eastern front, however, the surprising advance of Prince Pyotr Dmitrievich Gorchakov prompted Fredrick to rush soldiers into Prussian Poland. Albert von Bonin, commanded only 10,000 Prussian soldiers which he dispersed across the east to maintain control over urban populations.