The Arab fleet's attempted blockade was neutralized by the Byzantine navy's Greek fire, and the Arab army was crippled by famine and disease during the unusually hard winter that followed.
The Arab fleet's attempted blockade was neutralized soon after their arrival by the Byzantine navy through the use of Greek fire. This allowed Constantinople to be resupplied by sea, while the Arab army was crippled by famine and disease during the unusually hard winter that followed.