The main Polish–Lithuanian forces arrived only on 26 July 1410. The siege was not intense: Polish King Jogaila was confident that Prussia had already fallen and began distributing land among his nobles. He sent his troops to capture numerous small castles that were left without garrisons. Only eight castles remained in Teutonic hands. The Knights were allowed to communicate with their allies. They send envoys to Sigismund of Hungary and Wenceslaus, King of the Romans, who provided a loan to hire mercenaries and promised to send Bohemian and Moravian reinforcements by the end of September. The Livonian Order sent 500 men as soon as its three-month truce with Lithuania expired. The siege, holding Jogaila’s army in place, helped to organize defensive forces in other parts of Prussia.
After the withdrawal of the Polish–Lithuanian forces, the Knights started taking back their fortresses. By the end of October, only four Teutonic castles remained in Polish hands – border towns of Thorn (Toruń), Nessau (Nieszawa), Rehden (Radzyń Chełmiński) and Strasburg (Brodnica). Jogaila raised a fresh army and dealt another defeat to the Knights in the Battle of Koronowo on 10 October 1410. Von Plauen, using his reputation as hero of Marienburg, was elected as the new Grand Master in November. Von Plauen wanted to continue warfare, but he was pressured by his advisers into peace negotiations. The Peace of Thorn was signed on 1 February 1411. It is considered a diplomatic victory for the Knights as they suffered only minimal territorial losses. The Siege of Marienburg and subsequent Peace of Thorn are seen as disappointing results of the great Battle of Grunwald.
The Marienburg Castle was captured by Poles during the Thirteen Years’ War (1454–66).