A short time later, as they were rushing along the base of a bluff, the Hermit was seen to disappear. "Hyar's ther cave!" panted Old Rocks, catching hold of the boy. "Right yar behind these boulders. In with yer!" Frank saw the dark mouth of the cave behind the bowlders, over which he vaulted. The cry of the child came out of the darkness of the cave. The Hermit and little Fay were there. "Reddy!" hissed Old Rocks, crouching behind the bowlders--"reddy ter repel invaders!" The Blackfeet were coming on, and their dusky forms suddenly appeared near at hand in the darkness. On his knees behind a bowlder, Frank had drawn a revolver, and he began firing with Old Rocks. The flash of the weapons blinded the boy for the moment, and he stopped shooting when he had fired three times. Old Rocks stopped at the same moment, growling: "Thet's ther way with ther onery skunks! They'll never come up and be shot down ther way they oughter!" The Indians had disappeared. "Where are they?" asked Frank, wonderingly. "Right near yere, you kin bet yer dust," answered the guide. "They drapped down ther instant we begun slingin' lead, an' they're huggin' ther yearth, you bet!" "Did we kill any?" "Wa-al, I dunno; but I'll allow thet I didn't do any shootin' fer fun. I don't b'lieve in thet under such circumstances." "This affair may bring on an Indian war." "Let'er bring! It'll be er good thing ef it does, an' ther hull Injun nation is wiped out. But ther chances are thet it'll never be heard of by anybody except them we tell it to. Ther varmints will make tracks outer ther park, fer they're on forbidden ground." "If the soldiers should turn up----" "It'd be a mighty good thing fer us. Still, I kinder reckon we'll be able ter hold Half Hand an' his gang off till they git weary." They took care that their revolvers were replenished with cartridges, and then Frank loaded his rifle. A sudden silence seemed to brood over the whole world. Old Rocks stirred uneasily. "I don't like it," he muttered, speaking to himself. "Don't like what?" asked Frank, who felt a foreboding of some coming catastrophe. "This yare stillness. Why, thar ain't even an owl hootin'." "What do you think it means?" "Dunno; but it means somethin'. Keep yer eyes an' ears open, an' be ready fer what may come." Little Fay had ceased her sobbing, and the silence was finally broken by her voice: "Who's doin' to tate me to my mamma?" Then the Hermit was heard trying to comfort and reassure her. "Dog my cats ef I wouldn't like ter smoke!" muttered Old Rocks; "but I'll allow thet it w'u'dn't do ter light a match hyar." "No; it might be fatal. The light----" The sharp report of a rifle rang out, and Frank fell backward behind the bowlder. With a grated exclamation, Old Rocks flung up his revolver, and took a snap shot at the spot where he had seen the red flash of the weapon as it was discharged. "Did you get him?" asked Frank, as he sat up.