King As-Saalih availed himself of this opportunity and headed towards Bayt Al-Maqdis, which the Ayyubids of Shaam had previously given up for the Crusaders, and intruded the fortresses of the Crusaders and liberated the Holy city with the help of his Khwarezmid-supported army in 643 A.H.

In this way, Bayt Al-Maqdis was entirely liberated, and for seven centuries, no Christian has ever been able to enter it, till the British armies entered it during World War I in 16-11-1917 A.D., as a result of the famous betrayal of Mustafa Kemal Ataturk; we ask Allaah The Almighty to Restore it once again to Islam and the Muslims.

As-Saalih Ayyoob then completed his way to Shaam and entered Damascus and unified both Egypt and Shaam anew, and moved to liberate some cities which were under the control of the Crusaders, and was able to liberate Tiberias, Ashkelon and others.

However, there was a dangerous change in the army of As-Saalih Ayyoob, May Allaah Have mercy upon him. The detachment of the Khwarezmid mercenaries broke away from the main army, after having been solicited by an Ayyubid emir in Shaam with a higher payment. This detachment not only broke away, but also fought As-Saalih Ayyoob himself, who faced it only with his genuine army which he had brought from Egypt under the leadership of the skilled Commander Rukn Ad-Deen Baybars.

As-Saalih Ayyoob came out from this tragic war fully aware that he should only depend on his army which was loyal to his person rather than his money. Thus, he started depending on new soldiers in place of the Khwarezmids, i.e. the Mamluks.