The Damiaatjes refer to two bells in the St. Bavochurch of Haarlem that ring every night between nine and nine thirty, to signal the closing of the city's gates and commemorate the conquest of the Egyptian city Damietta during the Siege of Damietta (1218). Though Haarlem no longer has a wall around the city, or gates to close, the bells are still rung every evening. Damietta is also mentioned during the Fifth Crusade in 1218/1219, and again during the Seventh crusade in the year 1249.The Haarlem story claims that Haarlem knights and innovative shipbuilders played an important role in the fall of Damietta. Access to the city via the Nile was closed with a large, heavy harbor chain. A Haarlem ship with a saw on the bow (in Dutch called the "zaagschip") was equipped with an iron saw fastened