Zul-Qa'dah
Is the eleventh month of the Islamic Calendar.

Zul-Qa'dah:- Is a month amongst the months of Hajj.

Events taken place during the month of Zul-Qa'dah:-
1)The battle of 'khandaq (trench) or Ahzab' took place in 5 A.H.
2)6 A.H.-Truce of Hudaubiyah
3)6 A.H 'Bay'at-e-Rizwaan' (The oath of allegiance named Rizwaan)
4)The return to Makkah for the performance of Umrah by the Prophet and his Companions in 7 A.H.

Taken from inter islam