Siege of Constantinople (717–718)

The great city of Constantinople, guarded by towering walls and the waters of the Bosporus, endured one of the most decisive sieges in European history. Saracen commander Moslemah (Maslama ibn Abd al-Malik) pressed a massive land-and-sea assault, seeking to break the Byzantine capital and open the way farther into Europe. The struggle reached its climax in 718, when the invaders finally withdrew, their hopes ruined by a defense marked by resolve, ingenuity, and providential turns of events.

Leo III and the Defense of the City

Emperor Leo III the Isaurian proved a steadfast leader under extreme trial. Scarcity and fear threatened to undo the defenders from within, yet the city held firm through famine, fire, and a brutal winter. Byzantines credited not merely strong planning but steadfast courage in the face of overwhelming odds—an example of perseverance under affliction. “Be on the alert. Stand firm in the faith. Be men of courage. Be strong.” (1 Corinthians 16:13).

Walls, Greek Fire, and Bulgaria’s Aid

Constantinople’s Theodosian Walls, among the mightiest fortifications of the ancient world, blunted repeated assaults. At sea, the daring use of Greek fire—an incendiary weapon projected against enemy ships—shattered morale and disrupted blockades. At a critical moment, timely help from Bulgaria struck the besiegers, tightening the noose around an army already weakened by hunger and cold. The siege’s end checked Islamic expansion into southeastern Europe and secured the empire for generations.

Deliverance and Thanksgiving

Because the deliverance came on the Feast of the Assumption, Byzantine Christians gave thanks to the mother of our Lord, trusting that God heard their prayers. Their gratitude reflected a deeply held conviction that the Lord humbles the proud and preserves the beleaguered. “Some trust in chariots and others in horses, but we trust in the name of the LORD our God.” (Psalm 20:7). Heroism on the walls and endurance in suffering were joined to public worship and thanksgiving.

Withdrawal, Storms, and Reports of Judgment

As the invaders withdrew, chroniclers report storms shattered many ships, while others burned when volcanic ash from Santorini fell upon them. Whether read as natural disaster or divine rebuke, such accounts underscored a lesson often drawn by Christian writers: God can use wind and wave to overturn human pride, and deliver His people when no strength remains but prayer. “God is our refuge and strength, an ever-present help in times of trouble.” (Psalm 46:1).