Second Arab siege of Constantinople

The Second Arab Siege of Constantinople (717-718) was a combined land and sea effort by the Arabs to take the capital city of the Byzantine Empire, Constantinople.

The Arab ground forces, led by Maslama ibn Abdal Malik, were defeated by Constantinople's seemingly impregnable walls and Bulgarian attacks while their naval fleet was defeated by Greek Fire and the remnants of it subsequently sunk in a storm on its return home. It is often compared to the more widely studied Battle of Tours in the fact that it halted Muslim expansion into Europe from the East for almost 700 years.