Pilėnai is a Lithuanian-language opera in four acts by Vytautas Klova to a libretto by Jonas Mackonis.
Ulrich a crusader emissary urges Margiris to fight against Gediminas as Rūtenis coming to visit Egle.
Not finding Mirta and Ulrich, Margiris sends Ūdrys to check the exit of the dungeon.
At the crusader camp Ūdrys finds Mirta and reveals that father died as a traitor to his homeland.
The defenders of Pilėnai are overwhelmed by the crusaders, and Gediminas' army does not arrive.