The inhabitants of Khaybar were proceeding to their fields...
The inhabitants of Khaybar were proceeding to their fields with the farm implements and pitchers of water. When they saw the Islamic army arrive, they ran back to their forts. When the Prophet (a.s) saw them running away, he raised the slogan of “allahu-akbar” and said: “Khaybar is destroyed!
Whenever we enter the borders of any place, those who were affected with bad times would have very bad times!” The Prophet (a.s) knew that Banū-Ghatafan were committed to help the Jews if hostilities erupted. He therefore camped his army strategically at the place called Rajih which was between the habitations of Khaybar and Banū-Ghatafan. The plan was to prevent Banū-Ghatafan from reaching to help the Jews.
When they heard of the arrival of Muslims and came out to go towards Khaybar, they were obstructed by the Muslim army. Fearing destruction of their own villages, they went back home. After the return of Banū-Ghatafan, the Muslims now moved for the siege of Khaybar. The Jews secured the women and children in the Fort al-Katibah and locking themselves in the other forts started a barrage of arrows on the Muslims.
After a few skirmishes, the Muslims took some of the fortresses, but victory depended on subduing the fort of Ibn Abil-Haqiq that was situated on a sloping hillock and that was called Qamūs. The fort too was called with this name. This is the same fort that is mentioned as Khaybar in the traditions and the history. In front of the fort there was a deep trench. The fort was rather invincible because of its location and construction.
In the Ghazwah generally, the command used to be with the Prophet (a.s) the standard bearer was `Ali (a.s). But the Prophet (a.s) was suffering for some days with pain in the temples and `Ali (a.s) was not able to join the ranks at Khaybar because he had conjunctivitis. Because of this some people got a chance of asserting themselves and, taking the standard in their hands without formal approval, thought of annexing the Fort Qamūs.
Therefore, `Umar held the flag in his hand and with one contingent of the army advanced to attack the fort He tried his best but did not succeed. He had to return disappointed and disillusioned. Then Abū-Bakr took the flag in his hand and got the same results. `Umar took the flag a second time and failed in his attempt. To cover [1] Sahīh Muslim, Vol 1, Page 459 his failure, he put the blame on the troops.