The Second Crusade: Causes, Battles, and Ultimate Failure

The Fall of Edessa: Triggering a New Holy War

While the First Crusade succeeded in establishing Christian realms in the Levant, these territories remained vulnerable. In December 1144, Imad al-Din Zengi, the Atabeg of Mosul and Aleppo, captured the County of Edessa, marking the first major loss of a Crusader State.

News of Edessa’s fall shocked Western Europe. In 1145, Pope Eugenius III issued the papal bull Quantum praedecessores, formally calling for the Second Crusade to defend Christian strongholds in the East.

Royal Leadership and Preaching

Unlike the First Crusade, the Second Crusade was led directly by European monarchs:

King Louis VII of France (accompanied by his wife, Eleanor of Aquitaine)

King Conrad III of Germany

The campaign gained massive recruitment support due to the persuasive preaching of Bernard of Clairvaux, a Cistercian monk whose sermons inspired thousands across France and the Holy Roman Empire to join the effort.

Misfortunes Across Anatolia

The campaign was plagued by poor logistics, mistrust with the Byzantine Empire, and military blunders:

Conrad’s Forces at Dorylaeum (1147): The German army was ambushed by the Seljuk Sultanate of Rum near Dorylaeum, losing a massive portion of its troops and supplies.

Louis’s March through Mount Cadmus (1148): French forces suffered heavy casualties in a Turkish ambush while crossing the rugged mountain terrain of Anatolia.

The Disastrous Siege of Damascus (1148)

Reaching the Levant in a weakened state, the Crusader leaders met at Council in Acre in July 1148. Rather than attempting to retake Edessa, they made the strategic decision to attack Damascus, a city that had previously been a neutral diplomatic ally to the Kingdom of Jerusalem.

The Siege of Damascus lasted only four days (July 24–28, 1148). Tactical errors led the Crusaders to move their camp from a well-watered orchard zone to an exposed position without water or protection. Facing imminent arrival of Muslim relief forces under Nur ad-Din, the Crusaders retreated in humiliation.

Legacy of the Second Crusade

The collapse of the Siege of Damascus ended the expedition. The failure damaged the prestige of the Papacy, strained relations between Western Europe and Byzantium, and galvanized Muslim unity across the Middle East under leaders like Nur ad-Din, setting the stage for Saladin.

Sources & Historical References

Phillips, Jonathan. The Second Crusade: Extending the Frontiers of Christendom. Yale University Press, 2007.

Constable, Giles. "The Second Crusade as Seen by Contemporaries." Traditio, Vol. 9, 1953, pp. 213–279.

Barber, Malcolm. The Two Cities: Medieval Europe 1050–1320. Routledge, 2004.