 Complete the following phrase:  Croatian hussars were irregular light horsemen characteristic of the Habsburg-Ottoman border area. Croatian units were not inevitably referred as Croats but it was the most commonly used name. ref Croatian hussars participated in the siege of Magdeburg which was led by Johann Tserclaes as well as the sieges of Heidelberg, Frankenthal, Manheim, Breitenfeld, Lützen, Nördlingen, 