The economic reason was that the inhabitants saw the Osmanlis settling themselves in all the country round about the three cities, and undisturbed in their permanent occupation of these regions by any aggressive movement from Constantinople. Nicomedia, although advantageously located for commerce, was not a port of call on the great trade route. It depended for its well-being upon an unrestricted communication with the interior. Brusa and Nicaea were manufacturing cities, whose prosperity was due to the use of raw materials produced in the vicinity, and to the ability to market the manufactured products. While food was still procurable, trade and business languished. When the Greeks saw that the Osmanlis had come in their midst to remain, and were not mere raiders like the Seljuk Turks, they realized that the alternative to submission was ruin. The moral reason I have already touched upon in relation to Brusa. If there had been any hope of relief from the intolerable economic conditions under which they were living, the Nicaeans and Nicomedians might have resisted indefinitely, and maintained a gallant struggle for love of God and country. Their successful resistance, continued through many weary years, is a remarkable testimony to their religious zeal and to their patriotism. It was not until they felt themselves deserted by their brothers of blood and religion that they finally yielded. The Osmanlis did not prevail over them in battle. Their walls were not stormed. Their gates held fast. They were not starved out. They were abandoned by the Byzantines. So they became Osmanlis. III To understand the how and why of the fall of these cities and of the mingling of victor and vanquished in one race, we must review the history of the Byzantines during the years immediately following the death of Osman. The loss of Brusa did not cause any cessation in the suicidal strife between Andronicus and his grandson. After the brilliant marriage festivities of which we have already spoken, young Andronicus took his bride to Demotika, where, in the summer of 1327, he planned to surprise and oust his grandfather.[95] He was not content to wait for the old man’s death. Nor was he deterred from reopening the civil war by the thought of the imminent danger of the Byzantine cities in Bithynia. Old Andronicus, informed of his grandson’s intention, forbade his entrance to the capital, and negotiated with the Serbians to attack him from the rear.[96] This was a deliberate invitation to the Serbians, who were rapidly becoming dangerous enemies of the Empire, to enter Byzantine territory.