In the interval of ten years between the capture of Nicæa and Nicomedia, Orchan was further engaged in extending his State elsewhere in Asia, not towards Angora, in the south, as stated by some historians, but to the north-west, in the ancient Mysia, by the conquest of the Emirate of Karasi, which lay immediately to the north of Sarukhan and with a frontage to the sea opposite to the island of Mytilene. The Emir of this State died in 1333. His two sons disputed the succession. The younger one was favoured by the Ottomans, and when he was put to death by his brother, Orchan sent an army ostensibly to avenge him. The Emir was driven into exile and his State was promptly annexed by Orchan. The same fate befell some other petty Emirates on the southern borders of the Marmora and the Hellespont, rounding off the boundary of the Ottoman State in the north-west corner of Anatolia. The population of Karasi and the smaller States was mainly Turkish, but there must have been many Greeks on the coast who probably adopted Islam, as had the majority of the Greeks of Brusa and Nicæa. After these acquisitions, and that of Nicomedia in 1338, there were no further additions to the Ottoman State in Asia Minor during Orchan’s reign. There followed, after the capture of Nicomedia, a few years of peace, and it may well be that, during this time, Orchan completed the scheme for the organization of his State and his army. Hitherto, when Othman and Orchan were involved in disputes with their neighbours, and it was necessary to use armed force in resistance or attack, an appeal was made for the voluntary service of all the male members of their petty State or clan capable of bearing arms; and the appeal was responded to without question. When the occasion for their service was at an end, the warriors returned to their homes and to their usual vocations. With a rapidly expanding territory and with great ambitions for further conquests, it was evidently thought necessary to constitute a permanent and well-disciplined force, and Orchan, whether adopting, or not, the plans of his brother Alaeddin, determined to effect this. On the one hand, he enrolled a considerable body of infantry for continuous service. They were subject to strict discipline and were well paid, and it will be seen that they could be sent beyond the realm to assist the Greek Emperor or otherwise.[4] On the other hand, a large body of horsemen was provided, not under continuous service, but under obligatory service, when occasion arose for calling them out.