A mass grave uncovered in Sidon, Lebanon, has shed new light on the Crusades and on the cruelty of medieval warfare, a new study in the academic journal PLOS ONE has shown. Archaeologists unearthed a large quantity of human bones in the moat of the Saint Louis Castle in South Lebanon. The area was first conquered by the Crusaders after the First Crusade in 1110. Some 150 years later, the Christian city was attacked and largely destroyed by the Mamluks in 1253 and then destroyed even more by the Mongols in 1260. Pursuing the idea of liberating the holy sites...