A native of the Swiss canton of Uri (he was probably born in Klingnau), Zwyer initially pursued a military career. From 1612 to 1617, he served in a mercenary regiment in the service of Spain and Milan; from 1619 to 1642 he was in service for the Habsburg emperors, first for Ferdinand II and then Ferdinand III.
A native of the Swiss canton of Uri (he was probably born in Klingnau), Zwyer initially pursued a military career. From 1612 to 1617, he served in a mercenary regiment in the service of Spain and Milan; from 1619 to 1642 he was employed by the Habsburg emperors, first for Ferdinand II and then for Ferdinand III.