The Crusaders followed south, and attacked the Tower of Galata, which held one end of the chain that blocked access to the Golden Horn. As they laid siege to the Tower, the Greeks counterattacked with some initial success. However, when the Crusaders rallied and the Greeks retreated to the Tower, the Crusaders were able to follow the soldiers through the Gate, and the Tower surrendered. The Golden Horn now lay open to the Crusaders, and the Venetian fleet entered.

http://www.boglewood.com/murano/constantinople.gif

http://www.geocities.com/egfrothos/Betrayal.jpg