Al-Fath 48:1

According to the reports, the opening of Surat al-Fath was revealed on the road back to Medina from the Treaty of Hudaybiyya in the sixth year of the hijra. While some Companions were grieved at returning without performing umra and at the treaty's terms, the verse “Indeed We have granted you a clear victory” declared the treaty a great triumph. As narrated in Bukhari, the Prophet said, “Tonight a sura has been revealed to me that is dearer to me than all that the sun rises upon.” Indeed, in the period after the treaty Islam spread rapidly, and two years later Mecca was conquered.

Buhârî 4172, 4177; Müslim 1786

Al-Fath is Medinan; sound reports establish that it was revealed on the return journey to Medina after the Treaty of Hudaybiyyah (6 AH). It declares the treaty, which had seemed a setback, to be 'a manifest victory', and commemorates the Pledge of Ridwan under the tree while promising victories to come.

Buhârî ve Müslim rivayetleri; siyer kaynakları