Now, thinning as they dropped below the corner of the wall, it left them naked to their enemies on the knoll.

At the same instant, from the marsh ahead, the sentinel in the round hat sprang up again, like an instantaneous mushroom.

He shouted, and waved to his fellows inland.
They had no time, however, to leave the high ground; for the whole chance of the adventure took a sudden and amazing turn.
Heywood sprang out of his stupor, and stood pointing.
"Look there!" he snarled.

"Those--oh!" He ended with a groan.

The face of his friend, by torchlight above the wall, had struck him dumb.