The Second Crusade (1147–1150) was the second major crusade launched from Europe. The Second Crusade was started in response to the fall of the County of Edessa in 1144 to the forces of Zengi. The War of the Second Coalition (1798–1802) was the second war on revolutionary France by most of the European monarchies, led by Britain, Austria and Russia, and including the Ottoman Empire, Portugal, Naples, various German monarchies and Sweden, though Prussia did not join this coalition and Spain supported France. The county had been founded during the First Crusade (1096–1099) by King Baldwin I of Jerusalem in 1098. While it was the first Crusader state to be founded, it was also the first to fall.
The Second Crusade was announced by Pope Eugene III, and was the first of the crusades to be led by European kings, namely Louis VII of France and Conrad III of Germany, with help from a number of other European nobles. The armies of the two kings marched separately across Europe. After crossing Byzantine territory into Anatolia, both armies were separately defeated by the Seljuk Turks. The main Western Christian source, Odo of Deuil, and Syriac Christian sources claim that the Byzantine Emperor Manuel I Komnenos secretly hindered the crusaders' progress, particularly in Anatolia, where he is alleged to have deliberately ordered Turks to attack them. Louis and Conrad and the remnants of their armies reached Jerusalem and participated in 1148 in an ill-advised attack on Damascus. The crusade in the east was a failure for the crusaders and a great victory for the Muslims. It would ultimately have a key influence on the fall of Jerusalem and give rise to the Third Crusade at the end of the 12th century. Their goal was to contain the expansion of the French Republic and to restore the monarchy in France. They failed to overthrow the revolutionary regime and French territorial gains since 1793 were confirmed. In the Treaty of Lunéville in 1801, France held all of its previous gains and obtained new lands in Tuscany, Italy, while Austria was granted Venetia and the Dalmatian coast. Britain and France signed the Treaty of Amiens in March 1802, bringing an interval of peace in Europe that lasted for 14 months. By May 1803 Britain and France were again at war and in 1805 Britain assembled the Third Coalition to resume the war against France.
The only significant Christian success of the Second Crusade came to a combined force of 13,000 Flemish, Frisian, Norman, English, Scottish, and German crusaders in 1147. Travelling from England, by ship, to the Holy Land, the army stopped and helped the smaller (7,000) Portuguese army in the capture of Lisbon, expelling its Moorish occupants.