context: The Hackelites were first used in the Polish war battles during the 17th century. The most famous battleground battles are probably Breitenfeld 1631, Rain 1632, Lützen 1632, Nördlingen 1634, Leipzig 1642 and Jankov 1645. Torsten Stålhandske was a Finnish-born master of the battlegrounds and later also a general of the cavalry.
question: When was Hakkapeliitat founded?
answers.text: 17th century