By: HISTORY.com Editors During the First Crusade, Christian knights from Europe capture Jerusalem after seven weeks of siege and begin massacring the city’s Muslim and Jewish population. Beginning in the 11th century, Christians in Jerusalem were increasingly persecuted by the city’s Islamic rulers, especially when control of the holy city passed from the relatively tolerant Egyptians to the Seljuk Turks in 1071. Late in the century, Byzantine Emperor Alexius Comenus, also threatened by the Seljuk Turks, appealed to the West for aid. In 1095, Pope Urban II publicly called for a crusade to aid Eastern Christians and recover the holy lands. The response by Western Europeans was immediate. The first crusaders were actually undisciplined hordes of French and German peasants who met with little success. One group, known as the “People’s Crusade,” reached as far as Constantinople before being annihilated by the Turks. In 1096, the main crusading force, featuring some 4,000 mounted knights and 25,000 infantry, began to move east. Led by Raymond of Toulouse, Godfrey of Bouillon, Robert of Flanders, and Bohemond of Otranto, the army of Christian knights crossed into Asia Minor in 1097. In June, the crusaders captured the Turkish-held city of Nicaea and then defeated a massive army of Seljuk Turks at Dorylaeum. From there, they marched on to Antioch, located on the Orontes River below Mount Silpius, and began a difficult six-month siege during which they repulsed several attacks by Turkish relief armies. Finally, early in the morning of June 3, 1098, Bohemond persuaded a Turkish traitor to open Antioch’s Bridge Gate, and the knights poured into the city. In an orgy of killing, the Christians massacred thousands of enemy soldiers and citizens, and all but the city’s fortified citadel was taken. Later in the month, a large Turkish army arrived to attempt to regain the city, but they too were defeated, and the Antioch citadel surrendered to the Europeans. After resting and reorganizing for six months, the crusaders set off for their ultimate goal, Jerusalem. Their numbers were now reduced to some 1,200 cavalry and 12,000 foot soldiers. On June 7, 1099, the Christian army reached the holy city, and finding it heavily fortified, began building three enormous siege towers. By the night of July 13, the towers were complete, and the Christians began fighting their way across Jerusalem’s walls. On July 15, Godfrey’s men were the first to penetrate the defenses, and the Gate of Saint Stephen was opened. The rest of the knights and soldiers then poured in, the city was captured , and tens of thousands of its occupants were slaughtered. The crusaders had achieved their aims, and Jerusalem was in Christian hands, but an Egyptian army marched on the holy city a few weeks later to challenge their claim. The Egyptians’ defeat by the outnumbered Christians in August ended Muslim resistance to the Europeans for the time being, and five small Christian states were set up in the region under the rule of the leaders of the crusade. 6 Surprising Discoveries From Medieval Times The Middle Ages have yielded a series of amazing archaeological discoveries, from medieval swords to buried castle remains to evidence of zombie fears. The Middle Ages have yielded a series of amazing archaeological discoveries, from medieval swords to buried castle remains to evidence of zombie fears. Also on This Day in History Discover more of the major events, famous births, notable deaths and everything else history-making that happened on July 15th Lafayette selected colonel-general of the National Guard of Paris On July 15, 1789, only one day after the fall of the Bastille marked the beginning of a new revolutionary regime in France, the French aristocrat and hero of the American War for Independence, Marie-Joseph Paul Roch Yves Gilbert du Motier, Marquis de Lafayette, becomes the colonel-general of the National Guard of Paris by acclamation. […] Rosetta Stone found During Napoleon Bonaparte’s Egyptian campaign, a French soldier discovers a black basalt slab inscribed with ancient writing, which becomes known as the Rosetta Stone. Pike expedition sets out across the American Southwest Zebulon Pike, the U.S. Army officer who in 1805 led an exploring party in search of the source of the Mississippi River, sets off with a new expedition to explore the American Southwest. Pike was instructed to seek out headwaters of the Arkansas and Red rivers and to investigate Spanish settlements in New Mexico. Pike […] Ford Motor Company takes its first order On July 15, 1903, the newly formed Ford Motor Company takes its first order from Chicago dentist Ernst Pfenning: an $850 two-cylinder Model A automobile with a tonneau (or backseat). The car, produced at Ford’s plant on Mack Street (now Mack Avenue) in Detroit, was delivered to Dr. Pfenning just over a week later. Henry […] Second Battle of the Marne begins with final German offensive On July 15, 1918, near the Marne River in the Champagne region of France, the Germans begin what would be their final offensive push of World War I. Dubbed the Second Battle of the Marne, the conflict ended several days later in a major victory for the Allies. The German general Erich Ludendorff, convinced that […] A notorious English killer is executed John Christie, one of England’s most notorious killers, is executed. 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