The hospital camp had been blotted out completely.

But from the north came a faint sullen note, and he knew that it was the throb of a great gun.

Julie heard it too.
"They're still firing," she said.
"Yes, but it may not be snowing so hard a few miles away from here.

I discovered when I was up in the air with Philip that the air moves in eddies and gusts and currents like the ocean, and that it has bays and straits, and this may be a narrow strait of snow that envelops us here.
Hear that! Guns to the south, too! One side is shelling the other's trenches.

You remember how it was in all the long fighting that we call the Battle of the Marne.