 Complete the following phrase:  Gallipoli became the main crossing point for the Ottoman armies moving between Europe and Asia, protected by the Ottoman navy, which had its main base in the city. Sultan Bayezid I  refortified Gallipoli and strengthened its walls and harbour defences, but initially, the weak Ottoman fleet remained incapable of fully controlling passage of the Dardanelles, especially when confronted by the Venetians. As a result, during the 