The battle Hostile_encounter took place Process_start in the westernmost part of modern-day Austria , in the vicinity of the southeast corner of Lake Constance , roughly southwest of the town of Bregenz .

Some Imperial troops fled Escaping to Bregenz , others attempted to board three nearby ships , which overturned Process_end in the chaos and sank Motion_directional , drowning Death many of the fleeing infantry and knights .

Dornbirn is located in the Austrian province of Vorarlberg , about south of Bregenz at the eastern end of Lake Constance .