Medieval technology that its potential was fully achieved. Artesian well (1126) A thin rod with a hard iron cutting edge is placed in the bore hole and repeatedly struck with a hammer, underground water pressure forces the water up the hole without pumping. Artesian wells are named after the town of Artois in France, where the first one was drilled by Carthusian monks in 1126. Central heating through underfloor channels (9th century) In the early medieval Alpine upland, a simpler central heating system where heat travelled through underfloor channels from the furnace room replaced the Roman hypocaust at some places. In Reichenau
Battle of Marj al-Saffar (1126) "Crusader forces had a clear win but were unable to press home their advantage." A third writer notes that the Crusader victory occurred because Toghtekin "fell from his horse and, thinking that he had been killed, his companions fled." Because of their heavy casualties, the Crusaders were forced to retreat. In 1129, the Franks attacked Damascus again, but their siege of the city was unsuccessful. Battle of Marj al-Saffar (1126) The Battle of Marj al-Saffar was fought on January 25, 1126 between a Crusader army led by King Baldwin II of Jerusalem and the Seljuk Emirate of Damascus, which was