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Aybars Arda KILICER
Preparation for the conquest of Istanbul started only one year ahead. Huge canons that were necessary for the siege were molded. In 1452, Rumeli Castle on the European side was constructed to control the Bosphorus. A mighty fleet of 16 galleys was formed. The number of soldiers were doubled. The supply routes to Byzantine were taken under control. An agreement was made with Genoese to keep Galata impartial during the war. In April 1453, the first Ottoman frontier forces were seen in front of Istanbul. The siege was starting.