Narrated Al-Bara:

Do you (people) consider the conquest of Mecca, the Victory (referred to in the Qur'an 48:1). Was the conquest of Mecca a victory? We really consider that the actual Victory was the Ar-Ridwan Pledge of allegiance which we gave on the day of Al-Hudaibiya (to the Prophet) . On the day of Al-Hudaibiya we were fourteen hundred men along with the Prophet (ﷺ) Al-Hudaibiya was a well, the water of which we used up leaving not a single drop of water in it. When the Prophet (ﷺ) was informed of that, he came and sat on its edge. Then he asked for a utensil of water, performed ablution from it, rinsed (his mouth), invoked (Allah), and poured the remaining water into the well. We stayed there for a while and then the well brought forth what we required of water for ourselves and our riding animals.