Siege of Königsberg
1262 CE.
Shown on the map at 54.717°, 20.517°.
The siege of Königsberg was a siege laid upon Königsberg Castle, one of the main strongholds of the Teutonic Knights, by Prussians during the great Prussian uprising from 1262 possibly though 1265.
Text from the Wikipedia article Siege of Königsberg, licensed CC BY-SA 4.0.