Following the Battle of Raszyn on April 19, the Polish forces commanded by Prince Józef Poniatowski left Warsaw undefended and withdrew to several fortresses located nearby (most notably to Modlin Fortress and Serock). The Austrians seized the Polish capital relatively easy, but it was a pyrrhic victory, as the Austrian force was now seriously overstretched and had a still unbeaten enemy in the vicinity of Warsaw, as well as new Polish forces gathering strength behind their lines in Greater Poland. Prince Este garrisoned Warsaw with 10,000 soldiers, and split his remaining forces, sending some 6,000 troops under Gen. to the right bank of the Vistula, and the rest towards Toruń and other targets on the left bank.