Did Wenceslas Work as a Mercenary?

We don't know much about his early life at all. It's not actually until the year 1419 when Jiska is approaching or in his 60s that we can actually start to say with any accuracy what he got up to. As early as 1406, he does crop up in documents accused of being abandoned and an outlaw. The best evidence we have for his work as a mercenary is his probable participation in the 1410 battle of Grunwald fighting for Poland and Lithuania against the Chutonic Order.