The Fourth Lateran Council in 1215 called for a new, better-organized crusade against Egypt. In late 1217 Andrew II of Hungary and Leopold VI, Duke of Austria arrived in Acre and, along with John of Brienne, raided territory further inland, including Mount Tabor, but without success. After the departure of the Hungarians, the remaining crusaders set about refortifying Caesarea and the Templar fortress of Château Pèlerin throughout the winter of 1217 and spring of 1218.