"Not much it ain't," responded the conductor. "If you think the army's goin' to wait a week, or even a day, on a bridge, you're simply not up to date, that's all. The old Buell and Rosecrans way o' doin' things is played out since Sherman took command. Your Uncle Billy's a hustler, and don't let that escape your mind for a minute, or it'll likely lead you into trouble. You'll find when you get down to Chattynoogy that nobody's asleep in daylight, or for a good part o' the night. They're not only wide-awake, but on the keen jump. The old man kin see four ways at once, he's always where he ain't expected, and after everybody with a sharp stick. In Buell's time a burnt bridge 50 foot long 'd stopped us for two weeks. Now that bridge 'll likely be finished by the time we git there. I've just been over there, and they were layin' the stringers." "Why, how in the world did they manage?" asked Si. "O, Sherman's first move was to order down here duplicates for every bridge on the road. He's got 'em piled up at Louisville, Nashville, Murfreesboro and Chattynoogy. The moment a bridge is reported burned a gang starts for the place with another bridge, and they're at work as soon's it's cool enough to let 'em get to the abutments. I've seen 'em pullin' away the burnin' timbers to lay new ones. They knowed at Chattynoogy as soon's we did that the bridge was burned. The operator at the next station must 've seen it and telegraphed the news, and they started a bridge-gang right out. I tell you, double-quick's the time around where old Cump Sherman is." "Duplicate bridges," gasped Si. "Well, that is an idee." "What does he mean by 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."