Rorschacher Klosterbruch
1489 CE.
Shown on the map at 47.467°, 9.483°.
The Rorschacher Klosterbruch or St. Gallerkrieg was a war between the Abbey of Saint Gall, Zürich, Lucerne, Schwyz and Glarus against the city of St. Gallen and Appenzell in 1489 to 1490.
Text from the Wikipedia article Rorschacher Klosterbruch, licensed CC BY-SA 4.0.