In 1371, Đurađ announced to the Republic of Ragusa that he, Vukašin Mrnjavčević and his son, Marko, along with their armies, were in Scutari, preparing an attack on Nikola Altomanović. Ragusa assisted their campaign by providing ships to transport men and supplies, since their campaign was in Ragusa's interest. However, the campaign never took place as Vukašin and Marko went to aid Vukašin's brother, Jovan Uglješa, in a campaign against the Turks, which ended up in total disaster, Vukašin and Uglješa and their army being wiped out in the Battle of Maritsa. Serbian Prince Lazar Hrebeljanović and Bosnian Ban Tvrtko I allied themselves to defeat Nikola Altomanović. Desperate for a strong ally, Altomanović began negotiations with Đurađ. Most historians agree that in concluding negotiations, Đurađ gained the towns of Trebinje, Konavle and Dračevica (Herceg Novi) from Altomanović, possibly a bribe to remain neutral within the war. Other historians, however, follow Mavro Orbini's account and argue that Đurađ never concluded such an agreement, rather conquered the towns he gained from the agreement himself after Altomanović was defeated in 1373.