On the border and in such times, man was compelled to observe with eye and ear, with all the five senses; and often too with a sixth sense, an intuition, an outgrowth of the other five, developed by long habit and training, which the best of the rangers possessed to a high degree, and in which the lad was not lacking.

He knew that the minutest trifle must not escape his attention, or the forfeit might be his life.
While he relaxed his own care not at all, he felt that the bird was a wary sentinel for him.

He knew that if an enemy came in haste through the undergrowth it would fly away before him.

He had been warned in that manner in another crisis and he had full faith now in the caution of the valiant little singer.

His trust, in truth, was so great that he rose from his covert and bent down for a third drink of the clear cool water.