The sun was still sufficiently high for him to catch the rays strongly on his small mirror.
Now, in the Army signaling work, one branch has to do with heliographing; that is, flashing a message by means of reflected rays of the sun's light.
Swiftly enough the young sergeant caught the flash, and found to his delight that he was able to throw a fairly long flash.
"Camp in hands of ruffians. Help quick!"
The Mirror Was Shot From Hal's Hand.
Despite his tremendous excitement, Sergeant Overton endeavored to steady his right hand enough to enable him to send the message quite clearly.
Again and again he flashed the message, until one of the invaders, glancing up at the tree top, caught sight of the work that was going on.
"That kid's trying to send word to some one," guessed the leader. "Here, cub, hand me that rifle."