The sentence was not finished. Frank, at the stern, gave a yell and fired out of the loophole. "Come here!" he shouted, then, "if you want to see what the devils are doing. This takes the cake!"
A glance showed the others what the plot against them was. Harry went to his locker for his revolver and Jack drew his from a pocket.
"I guess it is a fight now!" Frank said. "You see what they are doing?"
"Of course. Anybody can see that."
Jack reached out of the opening and fired a perfect volley down stream. Frank crowded against him to look out.
"Never touched them!" he cried.
"No," Jack went on, "they're forming a bridge with their canoes and running logs and brush down against it. They've got an obstruction already that the Black Bear never can get through."
"What's the matter with dynamite?" asked Harry.
"Oh, we can use dynamite as long as we have it," was the reply, "but there will be Indians on guard there long after we are out of the stuff."
"I guess that's right!" with a sober drawing of the lips.