Bomber Brigade
The Bomber Brigade () was a World War II unit of the Polish Air Force commanded by płk obs. Władysław Heller. It resisted the Invasion of Poland in 1939 as the main aerial reserve of the commander in chief and was used for bombing enemy units in central Poland. It was created just before the war and did not have time to reach full operational readiness. Its equipment consisted of 36 modern PZL.37 Łoś medium bombers, 50 older PZL.23 Karaś light bombers, as well as 21 support planes. It was organised into four squadrons, each in turn composed of  two escadrilles. It was similar in make-up to the Pursuit Brigade. 10th Bomber Squadron was previously called: "210 Dywizjon". 15th Bomber Squadron was previously called: "215 Dywizjon". Some reports mention another Bomber Squadron called: 20th Bomber Squadron was previously called: "220 Dywizjon". Another small Bomber unit was the Flight based at Dęblin, the Polish Air Force Training Academy. During the Invasion of Poland, their unit flew many operations using PZL.23 Karaś light bombers.