My Pierwsza Brygada (EN: We Are the First Brigade) is a well known military march of the Polish Legions led by Józef Piłsudski, going on to help with the formation of The Second Polish Republic.
The song's melody was borrowed from the songbook of the Kielce Fire Department, likely being composed by Andrzej Brzuchal-Sikorski sometime after 1905. The earliest version of the song appeared in 1917, with the lyrics being composed by various individuals.