"Put out your lamps, boys, an' we'll show these fools what can be done."
In an instant the tunnel was plunged in profound darkness, and the lights worn by the boys served to reveal their whereabouts clearly.
Both realized how great would be the disadvantages under such circumstances, and in the least possible time the tiny flames were extinguished.
Even while this was being done the rioters attempted to effect an entrance; but, without exposing himself to a blow, Sam discharged his weapon, paying little regard to accuracy of aim.
The noise of the report echoed and reëchoed through the passages, and the chamber was filled with smoke, during which time Fred fancied he saw a form leaning half through the aperture, and he also fired.
"That makes two cartridges, an' now we've only got ten left," Sam said in a half whisper. "At this rate we can't keep the battle goin' a great while, an' when the thing is ended we shall have to take whatever they choose to give."
"Donovan may send some one before the ammunition is exhausted."
"He won't think of such a thing for a good many hours yet. Could you find your way back to where the men are at work on the pumps?"
"And leave you alone?"
"One of us must go, or else these fellows will soon be where a great amount of mischief can be done."