The Boy Allies With the Cossacks (Esprios Classics)

"Under Hal's firm hand the aëroplane came down gently, until at last it was soaring close to the treetops. And now, suddenly, both lads made out the cause of Marquis's uneasiness.
Beneath them were thousands upon thousands of armed men. To the north, to the south, and to the east and west the dense mass of humanity stretched out. Hal and Chester, flying close to the earth, at last could make out moving forms below them."