London

The Wall made its own weather. As Tom and Hester neared the top the air grew thin and chill and big fluttering snowflakes brushed their faces like butterfly wings. They could see lantern-light on a broad platform ahead where a gas tanker was lifting away empty from the High Eyries. Then there was an unbelievable gout of flame shooting out of the face of the Wall, and another and another, as if it were dragons, not airships, that were stabled there. Caught in the blast, the tanker’s envelope exploded, white parachutes blossoming around it as it began to fall. Hester stopped for a moment and looked back, flames shining in her eye. “He’s done it! We’re too late! He’s fired their Air-Fleet!”

> > [...]

It was like running into an oven. He had an impression of a huge cavern, with smaller caverns
opening off it, the hangars where the League’s warships were housed. Valentine must have gone quickly from one ship to the next, placing phosphorus bombs. Now only their buckling ribs were visible in the white-hot heart of the blaze. “Hester!” shouted Tom, his voice lost in the roar of the flames, and saw her a little way ahead of him, hurrying down a narrow tunnel that led deeper into the Wall. I’m not following her in there! he thought. If she wants to get herself trapped and roasted, that’s her lookout. … But as he turned back towards the safety of the platform, the ammunition in the gondolas of the burning airships caught, and suddenly there were rockets and bullets flying everywhere, bursting against the stone walls and howling through the air around him. The tunnel was closer than the main entrance and he scrambled into it, whispering prayers to all the gods he could think of.

Chapter 29: A stranger in the mountains of heaven, Mortal Engines, pg 119/152