In June , Tvrtko 's supporters defeated a Hungarian army .
In June , Tvrtko 's supporters thus prevented Ostoja from reclaiming the crown , but the chief royal residence of Bobovac and the Usoran town of Srebrenik were captured and restored to Ostoja .
In June , Tvrtko 's supporters defeated a Hungarian army and thus prevented Ostoja from reclaiming the crown , but the chief royal residence of Bobovac and the Usoran town of Srebrenik were captured and restored to Ostoja .