The
Fifth Crusade in 1217 was another attempt to take back Jerusalem and the rest of the Holy land by going through Egypt again.
The Crusader armies were organized by Pope Honorius III and were lead by Leopold VI of Austria and Andrew II of Hungary but
they did not succeed in taking back Jerusalem.
Later
in 1218 the Germans took an army led by Oliver of Cologne and other armies of Dutch, Flemish, and Frisian soldier led by William
I, Count of Holland. So they didn't have to fight on two different fronts they allied themselves with the Seljuk Sultanate
of Rum in Anatolia who attacked the Ayyubids in Syria. After winning the port of Damietta the Crusaders marched
south against Cairo in July of 1221, but had to turn back because of a shortage of supplies. The Sultan Al-Kamil
attacked their army at night resulting in many crusader losses and eventually they surrendered. Al-Kamil signed a treaty for
an eight-year peace.