The question arises as to who will execute tutelage over the minor children of the late Lower Bavarian Dukes, thus also commanding the tremendous economic power of this region.

Their Upper Bavarian cousin, Duke Louis, is the choice within the several branches of the Bavarian line of the House of Wittelsbach, as well as the burghers of the Lower Bavarian cities.

The dukes’ widows and the local aristocracy prefer Duke Frederick I of Austria, the Fair, also Louis' cousin, both of whom had been raised and educated together in Vienna.

After Louis militarily occupies Landshut and Straubing, at this time the two most important towns of Bavaria,the ducal widows decide to call their children's Austrian cousin for assistance, although in the decade before, Lower Bavaria had bitterly fought Austria over lands, economic resources and sovereignty.

Finally, the decisive battle between Bavaria and Austria for control over these fertile and economically attractive lands is fought at Gammelsdorf on November 9, 1313.

The Upper Bavarians and troops deputized by the Lower Bavarian towns are led by Duke Louis, while the aristocracy and knighthood of Lower Bavaria and the Austrians are led by the Duke Frederick.

At the end of the day, Louis is victorious, the Austrians suffering a severe defeat.

Frederick is forced to renounce his tutelage over the Lower Bavarian dukes.

Louis, by his victory, brings to a halt for waht will be a long time the Habsburg quest to annex of parts of Bavaria.