Sorry, what do you mean by "without facing single war"? The Ottomans had fled the city in the face of the British advance as it was not defensible, risked facing a complete siege and their lines had been broken. The text of the surrender itself also cited a desire to avoid damage to the holy places. Fighting in the vicinity of the city prior to that, however, was quite intense even if it was characterized by a general near-continuous British advance.

In a somewhat comic moment the city's civil authorities actually had trouble surrendering the city because they kept surrendering to subordinate British units. IIRC they ended up formally surrendering Jerusalem four times.