The claim of an attack on a U.S. warship by North Vietnamese forces
Ottoman Turks was most threatened by the Byzantine Empire in 1050
<h3>The destruction of Byzantine Empire</h3>
The conquest of Constantinople by Sultan Mehmed II of the Ottoman Empire. The dwindling Byzantine Empire came to an end when the Ottomans breached Constantinople's ancient land wall after besieging the city for 55 days.
Therefore, the group most threatened the Byzantine Empire is Ottoman Turks.
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