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In page Fall of Constantinople:

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The army converged upon the Augusteum, the vast square that fronted the great church of Hagia Sophia whose bronze gates were barred by a huge throng of civilians inside the building, hoping for divine protection. After the doors were breached, the troops separated the congregation according to what price they might bring in the slave markets.[citation needed] Ottoman casualties are unknown but they are believed by most historians to be severe due to several unsuccessful Ottoman attacks made during the siege and final assault.[citation needed] The Venetian Barbaro observed that blood flowed in the city "like rainwater in the gutters after a sudden storm" and that bodies of Turks and Christians floated in the sea "like melons along a canal".[13]