"In less than a half hour they'll be at the ford." "But I doubt if they know what is waiting for them," said Harry.
The cloud of dust rapidly came nearer, and now they heard the beat of horses' feet and the clank of artillery.

Harry began to breathe hard, and he and the other young officers walked up and down the lines of their company.

All the Invincibles clearly saw that great plume of dust, and heard the ominous sounds that came with it.

It was very near now, but suddenly the fringe of forest on the far side of the river burst into flame.

The hidden riflemen had opened fire and were burning the front of the advancing army.
But the Northern men came steadily on, rousing the riflemen out of the bushes, and then they appeared among the trees on the north side of Bull Run--a New York brigade led by Tyler.