The Battle of Gammelsdorf took place in November 1313. The cause of the skirmish was the guardianship of the underage duke of Lower Bavaria. This was sought by both Duke Louis the Bavarian and Duke Frederick I of Austria. It circled around the question of who would execute tutelage over the minor children of the late Lower Bavarian Dukes, thus also commanding the tremendous economic power of that region. Their Upper Bavarian cousin, Duke Louis, the later Emperor Louis IV, the Bavarian, as agreements within the several branches of the Bavarian line of the House of Wittelsbach determined and as the burghers of the Lower Bavarian cities wanted to see it done, or Duke Frederick I of Austria, the Fair, also Louis' cousin, both having been raised and educated together in Vienna.
After Louis had militarily occupied the then two most important towns of Bavaria, Landshut and Straubing, the ducal widows decided to call their children's Austrian cousin for assistance - though in the decade before…
Wikipedia https://en.wikipedia.org/wiki/Battle_of_Gammelsdorf
Official Website http://www.gammelsdorf.de/schlacht.htm
Address Hauptstraße, 85408, Germany
Coordinates 48°33'2.349" N 11°56'42.508" E