Trajan, meanwhile, was building a large force for a full-scale invasion. Decebalus tried to negotiate a peace settlement, but Trajan demanded that Decebalus surrender himself, which he refused to do. Decebalus' allies among the surrounding tribes seem to have deserted him at this point. Trajan launched a direct attack on the Dacian capital, Sarmizegetusa. After a long siege of Sarmizegetusa and a few skirmishes in the nearby region, the Romans conquered the Dacian capital. Decebalus managed to escape with his family. He and his remaining supporters continued a guerrilla campaign in the Carpathian mountains.