During the Invasion of Poland, 2nd Legions Infantry Division was a reserve unit of Army Łódź. Commanded by Colonel Edward Dojan-Surówka, it detrained at Łask and took positions near Zelów. On September 2, 1939, it was sent to Belchatow, and its elements fought in the Battle of Borowa Góra. In the night of September 8/9, 1939, Colonel Dojan-Surowka suffered a nervous breakdown and abandoned his soldiers. He was replaced by Colonel Antoni Staich. Later, the division took part in the Battle of Wola Cyrusowa, and finally, fought in the Battle of Modlin, capitulating on September 29, 1939. A number of its soldiers were killed by the Germans in the Massacre in Zakroczym.