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In page Itter Castle:

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On the afternoon of May 4, 1945, the prison's commander fled. Shortly after the SS-Totenkopfverbände guards followed, the prisoners armed themselves and awaited rescue from anticipated attack from Waffen SS troops still aggressively resisting surrender. Two Sherman tanks of the 23rd Tank Battalion of the U.S. 12th Armored Division under the command of Capt. John C. ‘Jack’ Lee, Jr., and anti-Nazi elements of the Wehrmacht under the command of Major Josef ‘Sepp’ Gangl, arrived.[1] Together the three groups repelled probes by SS reconnaissance elements throughout the night. The battle continued through the morning of 5 May, with a strong force of 100–150 SS pressing the attack until reinforcements from the American 142nd Infantry Regiment arrived around 4 PM that day.[2][3]