October 1097 – June 1098 · Syria Theater

The great city of Antioch held the First Crusade at bay for eight grueling months, the besiegers themselves starving and dying outside its walls. The crusaders finally took the city through treachery in June 1098 — only to be immediately besieged in turn by a relief army under Kerbogha of Mosul. Half-starved and desperate, and inspired by the discovery of the Holy Lance, they sallied out and routed Kerbogha's far larger force.

June – July 1099 · Judea Theater

After a three-year march of unimaginable hardship, the surviving crusaders reached Jerusalem, held by a Fatimid garrison. Suffering from thirst and heat, they built siege towers from scarce timber and, on 15 July 1099, stormed the walls. The capture was followed by a notorious massacre, the soldiers slaughtering Muslim and Jewish inhabitants in the streets and in the al-Aqsa Mosque.

July 4, 1187 · Galilee Theater

Saladin lured the main field army of the Kingdom of Jerusalem across a waterless plateau in the July heat, then surrounded it near the twin hills called the Horns of Hattin. Maddened by thirst and harried by fire and arrows, the crusader army was annihilated. King Guy was captured, the relic of the True Cross was taken, and Saladin personally executed the notorious Raynald of Châtillon.

August 1189 – July 1191 · Levantine Coast Theater

The pivotal struggle of the Third Crusade was the nearly two-year siege of the coastal city of Acre, where a crusader army besieging the garrison was itself encircled by Saladin's relief force in a vast double siege of attrition, disease, and assault. The arrival of the kings of England and France finally tipped the balance, and Acre surrendered in July 1191.

September 7, 1191 · Levantine Coast Theater

Marching south from Acre toward Jaffa along the coast, Richard's disciplined army endured constant harassment from Saladin's mounted archers. At Arsuf, Richard held his knights in tight formation under galling fire until the perfect moment, then unleashed a devastating charge that broke the Muslim army and won the field.

April 1204 · Byzantium Theater

Diverted by debt, ambition, and Venetian scheming, the Fourth Crusade never reached the Holy Land. Instead it attacked Constantinople, the greatest Christian city in the world, and in April 1204 stormed and sacked it for three days — looting its churches, melting its bronzes, and shipping its treasures and relics west.

February 1250 · Egypt (Nile Delta) Theater

King Louis IX's Seventh Crusade invaded Egypt, aiming to strike at the heart of Ayyubid power. At Mansurah a rash charge by Louis's brother Robert of Artois into the town's streets was ambushed and destroyed by the Mamluk soldier Baibars. The crusade then collapsed; disease and encirclement forced the entire army to surrender, and King Louis himself was captured and ransomed.

April – May 1291 · Levantine Coast Theater

The Mamluk sultan al-Ashraf Khalil brought an enormous army and siege train against Acre, the last great Crusader city. After six weeks of bombardment and mining, the Mamluks stormed the walls in May 1291. The defenders, including the military orders, fought to the end; the Templar Grand Master was killed, and the survivors were slaughtered or enslaved as the city fell.