News of Teutonic reinforcements from the West and relief troops from Livonia prompted the Lithuanian Grand Duke Vytautas to withdraw from hostilities. It became clear to the remaining Poles that the siege would not be effective as the nobility from Lesser Poland also wanted to end the war before the harvest, and the siege was eventually lifted on 19 September.
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News of Teutonic reinforcements from the West and relief troops from Livonia prompted the Lithuanian Grand Duke Vytautas to withdraw from hostilities. It became clear to the remaining Poles that the siege would not be effective as the nobility from Lesser Poland also wanted to end the war before the harvest, and the siege was eventually lifted on 19 September.
Looks like it's half of the truth.