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 Austrian defeat in 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 . In the early hours of April 25 the force attacked the town from two sides and commenced a synchronised attack . The Austrians withdrew to the town ' s centre , but soon their cavalry was forced to retreat and the infantry battalions were now isolated . After a brief close quarters fight , the two Austrian battalions with their remaining 37 officers surrendered . The losses for the Polish side were 19 killed and 27 wounded . The losses for the Austrians included approximately 2 , 000 prisoners of war and many killed and wounded . Although the battle was not a decisive defeat for the Austrians , it was one of a series of skirmishes they lost on the eastern bank of Vistula . Finally on May 2 and May 3 the entire corps under Gen . Mohr was defeated at Ostrówek and its pontoon bridge across the river was destroyed , thwarting any further attempts to advance further east . This gave Poles enough time to leave the Austrians locked in Warsaw to their fate and liberate much of Galicia without much opposition from the enemy .