y duplicate, Corpril?" asked Harry Joslyn to Shorty.

"O, duplicate's something that you ring in on a feller like a cold
deck."

"I don't understand," said Harry.

"Why--hem--hem--duplicate's the new-fangled college word for anything
that you have up your sleeve to flatten a feller when he thinks he's
got you euchered. You want to deal the other feller only left bowers and
keep the right bowers for yourself. Them's duplicates. If you give him
aces, have the jokers handy for when you want 'em. Them's duplicates.
Duplicates 's Sherman's great lay--learned it from his old side-partner,
Unconditional Surrender Grant--just as strategy was old McClellan's.
There's this difference: Sherman always stacks the deck to win himself,
while McClellan used to shuffle the cards for the other feller to win."

"Still I don't understand about the duplicate bridges," persisted Harry.

"Why, old Sherman just plays doublets on the rebels. He leads a king
at 'em and then plumps down an ace, and after that the left and right
bowers. They burn one bridge and he plumps down a better one instead.
They blow up a tunnel and he just hauls it out and sticks a bigger one
in its place. Great head, that Sherman. Knows almost as much as old Abe
Lincoln himself."

"Do you say that Sherman has extra tunnels, too, to put in whenever one
is needed?" asked Harry, with opening eyes.

"O, cert," replied Shorty carelessly. "You seen that big iron buildin'
we went into to git on the cars at Louisville? That was really a tunnel,
all ready to be shoved out on the road when it was needed. If you hadn't
bin so keen on the lookout for guerrillas as we come along you'd 'a'
seen pieces o' tunnels layin' all along the road ready for use."

As the train dashed confidently over the newly-completed bridge the boys
gazed with intense interest and astonishment at the still smoldering
wreckage, which had been dragged out of the way to admit the erection
of the new structure. It was one of the wonders of the new, strange life
upon which they were entering.

The marvelous impressiveness and beauty of the scenery as they
approached Chattanooga fascinated the boys, who had never seen anything
more remarkable than the low, rounded hills of Southern Indiana.

The towering mountains, reaching up toward the clouds, or even above
them, their summits crowned with castellated rocks looking like
impregnable strongholds, the sheer, beetling cliffs, marking where the
swift, clear