Polish infantry in a trench near Radzymin

The Battle of Radzymin (Polish: Bitwa pod Radzyminem) took place during the Polish–Soviet War (1919–21). The battle occurred near the town of Radzymin, some 20 kilometres (12 mi) north-east of Warsaw, between August 13 and 16, 1920. Along with the Battle of Ossów and the Polish counteroffensive from the Wieprz River area, this engagement was a key part of what later became known as the Battle of Warsaw. It also proved to be one of the bloodiest and most intense battles of the Polish-Soviet War.

• http://en.wikipedia.org/wiki/Battle of Radzymin (1920)