The last campaign Abu Ayyub Al-Ansari (may Allah be pleased with him) took part in was the one prepared by Mu’awiyah and led by his son Yazid against Constantinople. Abu Ayyub at that time was a very old man, almost eighty years old. But that did not prevent him from joining the army and crossing the seas as a graze in the path of God. After only a short time engaged in the battle, Abu Ayyub fell ill and had to withdraw from fighting. Yazid came to him and asked..
“What is it you need, Abu Ayyub?”
“Convey my salaams to the Muslim armies and say to them:
‘Abu Ayyub urges you to penetrate deeply into the territory of the enemy as far as you can go, that you should carry him with you and that you should bury him under your feet at the walls of Constantinople.”‘ Then he breathed his last.
The Muslim army fulfilled the desire of the companion of the Messenger of God. They pushed back the enemy’s forces in attack after attack until they reached the walls of Constantinople. There they buried him.