"Then we must watch sharp," declared White Otter. "Perhaps they will ride over here and find us."
Then they heard the wail of a prairie wolf a short distance to the westward. There was something about it that made them suspicious. As a precaution against being betrayed to prowling foes, White Otter dismounted and seized the nose of the little piebald. The other ponies also showed signs of nervousness, and their riders quickly followed the example of the cautious Ogalala. Then the three anxious Sioux scouts stood beside their ponies and strained their ears to catch a warning of danger. Three times the dreary call of the prairie wolf sounded from the west, and each time the suspicions of the Sioux grew stronger. They felt almost certain that it was a signal from their enemies.
"That does not sound like Mayash, the prowler," White Otter declared suspiciously.
"It is different," agreed Lean Wolf.
At that moment they heard the cry repeated in the north. They knew at once that it was an answer to the signal from the west. It was evident that foes were on two sides of them, and the Sioux realized that they were in a serious predicament.
"It is bad," whispered White Otter. "I believe Blackfeet scouts are out there in the darkness. They are close. We must watch out."
"Do you believe they know us?" Little Raven inquired, anxiously.
"No," White Otter told him. "Lean Wolf, how do you feel about it?"
"I believe it is the Blackfeet," said Lean Wolf. "We must wait here until we see what they are going to do. If we hear them coming here then we will ride away before they find us."
"It is the best thing to do," White Otter told him.