Wolf knew that his cries were assembling the hunt-pack.

Nearer and nearer came the responses of the leaders, and there were now only momentary rests between the deep-throated exhortations which he sent in all directions into the night.
Suddenly, almost from the swamp itself, there came a quick, excited, yelping reply, and Wabi gripped Rod by the arm.
"He has struck the place where you killed the buck," he whispered.
"There'll be quick work now!" Hardly had he spoken when a series of excited howls broke forth from the swamp, coming nearer and nearer as the hunger-crazed outlaw of the plains followed over the rich-scented trail made by the two Indians as they carried the slaughtered deer.

Soon he nosed one of the trails of blood, and a moment later the watchers saw a gaunt shadow form running swiftly over the snow toward Wolf.
For an instant, as the two beasts of prey met, there fell a silence; then both animals joined in the wailing hunt-pack cry, and the wolf that was free came to the edge of the great rock and stood with his fore feet on its side, and his cry changed from that of the chase to the still more thrilling signal that told the gathering pack of game at bay.
Swiftly the wolves closed in.

From over the edge of the mountain one came and joined the wolf at the rock without the hunters seeing his approach.

From out of the swamp there came a pack of three, and now about the rock there grew a maddened, yelping horde, clambering and scrambling and fighting in their efforts to climb up to the game that was so near and yet beyond their reach.