 There were incidents during the crossing of the Drava and Tisza rivers, but the Sava was crossed on 28 June without incident.In Belgrade, Frederick staged a tournament, held a court, conducted a census of the army and wrote to the Byzantine emperor Isaac II to inform him that he had entered Byzantine territory.The army, still accompanied by Béla III, left Belgrade on 1 July, crossed the Morava and headed for Braničevo, which was the seat of the local Byzantine administration since Belgrade had been devastated in recent wars with the Serbs.