Political considerations following the duke's election to the throne of Poland in May 1573 resulted in negotiations, culminating on 24 June 1573, that lifted the siege on 6 July 1573. The Edict of Boulogne signed shortly thereafter brought an end to this phase of the civil war.
Political factors influencing the duke's election as king of Poland in May 1573 led to discussions that culminated by June 24, 1573, resulting in the siege being lifted on July 6, 1573. The Edict of Boulogne signed afterward concluded this civil war phase.