From this train of painful and exciting thought the wretched captive was aroused, by a faint but continued yelling in a distant part of the forest, and in the direction that had been taken by Wacousta and his warriors.  Then, after a short interval, came the loud booming of the cannon of the fort, carried on with a spirit and promptitude that told of some pressing and dangerous emergency, and fainter afterwards the sharp shrill reports of the rifles, bearing evidence the savages were already in close collision with the garrison.  Various were the conjectures that passed rapidly through the mind of the young officer, during a firing that had called almost every Indian in the encampment away to the scene of action, save the two or three young Ottawas who had been left to guard his own person, and who lay upon the sward near him, with head erect and ear sharply set, listening to the startling sounds of conflict.  What the motive of the hurried departure of the Indians was he knew not; but he had conjectured the object of the fierce Wacousta was to possess himself of the uniform in which his wretched servant was clothed, that no mistake might occur in his identity, when its true owner should be exhibited in it, within view of the fort, mangled and disfigured, in the manner that fierce and mysterious man had already threatened.  It was exceedingly probable the body of Donellan had been mistaken for his own, and that in the anxiety of his father to prevent the Indians from carrying it off, the cannon had been directed to open upon them.  But if this were the case, how were the reports of the rifles, and the fierce yellings that continued, save at intervals, to ring throughout the forest to be accounted for?  The bullets of the Indians evidently could not reach the fort, and they were too wily, and attached too much value to their ammunition, to risk a shot that was not certain of carrying a wound with it.  For a moment the fact itself flashed across his mind, and he attributed the fire of small arms to the attack and defence of a party that had been sent out for the purpose of securing the body, supposed to be his own; yet, if so, again how was he to account for his not hearing the report of a single musket?  His ear was too well practised not to know the sharp crack of the rifle from the heavy dull discharge of the musket, and as yet the former only had been distinguishable, amid the intervals that ensued between each sullen booming of the cannon.  While this impression continued on the mind of the anxious officer, he caught, with the avidity of desperation, at the faint and improbable idea that his companions might be able to penetrate to his place of concealment, and procure his liberation; but when he found the firing, instead of drawing nearer, was confined to the same spot, and even more fiercely kept up by the Indians towards the close, he again gave way to his despair, and resigning himself to his fate, no longer sought comfort in vain speculation as to its cause.  His ear now caught the report of the last shell as it exploded, and then all was still and hushed, as if what he had so recently heard was but a dream.