An unusual heatwave, tinder-dry under growth and gusting wind created all the conditions for an inferno.
And the green hills of Saddleworth have been turned black by the flames, with the smoke affecting the city of Manchester ten miles away.
The moor has burned before, but not as badly as this.
All the really smoky, it’s dry, it’s windy, there’s, there’s pockets of fire everywhere. Wind direction changes, it’s dangerous.
Why is it so difficult to fight this particular fire?
Because it just keeps popping up in different areas, so you think you’ve got it and then it comes underneath and pops somewhere else.
On Tuesday night, the blaze was officially designated a major incident and a nearby housing estate evacuated.
You’ve never seen no like it last night, 20:00 say, for flames coming straight towards us, just we need a little help to put this back.
We’re going to leave because the smoke was really, really sort of dense and you could hardly breathe, bless your eyes were burning as well.
Some people you know they were just giving masks away to help others to breathe.
More than 100 firefighters from across the north of England have been called in.
All in all, some two thousand acres of the moor has been destroyed by this fire and you can see that the wind is blowing, the smoke across and causing this kind of thing.
Look down here, another outbreak of fire, just where the firefighters have already put much of it out.
Emergency services expected to take at least a week to extinguish the fire for certain.