He set to work, standing below the bank and pointing between an intervening bush or two, making sure, however, that an unobstructed path was open for his arrow. The missile was pointed at an elevation of fully forty-five degrees; and, with one eye closed, he slowly drew back the string until the head touched the right hand, which grasped the middle of the bow.

It was held thus ten seconds, during which the athlete was as rigid and motionless as if moulded in iron, while his eye rested on the narrow slit-like window cut in the solid logs, all of a hundred yards away.

Ned Preston kept his gaze fixed on the Indian, who at that moment formed a picture worthy of the finest artist that ever touched brush to canvas.

Suddenly there was a faint twang, the bow straightened out like lightning, and the arrowy messenger started on its path weighted with the all-important message.

Preston instantly glanced at the block-house, centering his eye on the straight opening, but with scarcely a hope that Deerfoot could succeed in what would certainly be a marvelous exploit.

As the arrow was speeding directly away from the lads, it was impossible to distinguish its course through the air, though it could have been seen easily, had they been stationed at right angles to its line of flight.

The Shawanoe, having discharged the weapon, immediately lowered it, and then peered forward to learn the result of his shot.

But Preston had scarcely time to fix his gaze on the distant window, when he saw something like the flutter of a shadow—so to speak—directly in the opening itself. It came and went with the quickness of a flash, and he could not define it.

But where was the arrow?

It vanished from sight the instant it left the bowstring, and Ned had not seen it since. It should have struck somewhere in a very few seconds, but had the head buried itself in the ground between the river and the block-house, the eagle-feather would have been visible. Had it fallen on the roof, its sharp point would have held the shaft motionless.