Battle of Radzymin (1809)  The Battle of Radzymin took place on April 25, 1809 during the brief Polish–Austrian War. The battle occurred at Radzymin, some north-east of Warsaw. 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. Johann Friedrich von Mohr to the right bank of the Vistula, and the rest towards Toruń and other targets on the left bank. The borough of Praga, located right across the Vistula from Warsaw, was initially left in Polish hands, garrisoned by a small force of 600 men. Mohr's force crossed the river near Karczew and on April 24 besieged the small Polish garrison of Praga. However, the following day the besiegers were assaulted from the back by a Polish division-sized sortie from the Modlin Fortress under Gen. Michał Sokolnicki. In what became known as the Battle of Grochów, the spearhead of the Austrian force was defeated and the Poles withdrew successfully. Simultaneously, further to the north-east, at Radzymin, a Polish force mounted yet another attack on overstretched Austrians. The town was held by relatively small Austrian forces consisting of the 2nd and 3rd Battalions from the 63rd "Graf Baillet" Infantry Regiment (under Ludwig Graf Baillet de Latour, younger brother of Field Marshal Maximilian Anton Karl, Count Baillet de Latour) and a detachment of hussars. The Polish force was similar in size and consisted of a squadron of uhlans under Capt. Piotr Strzyżewski and a single infantry battalion from the 6th Infantry Regiment under Julian Sierawski. The force was supported by a single 2-gun battery of mounted artillery. Overnight of April 24 the Polish force left Serock and crossed the Narew, reaching Radzymin before daylight.