sentences:  In January 1251 an-Nasir Yusuf led another army to Egypt and clashed with Aybak's army in a significant battle with Yusuf's defeat.He fled back to Damascus, though some of his soldiers who could reach Cairo spread the initial impression inside Egypt that Yusuf had won the battle.Later when the news of Aybak's ultimate victory arrived, the soldiers and their commanders were arrested, and Aybak sent back the soldiers, some 3,000 in number, to Damascus on the backs of donkeys.