Civil War acoustic shadows

the long version

"The careers of Robert E. Lee, Ulysses S. Grant, and a number of other prominent Civil War generals were dramatically affected by unusual battlefield acoustics. Commanders who inadvertently placed themselves in an acoustic shadow ran the risk of letting victory slip away. Stranger still, battles inaudible to generals several miles from the fighting were sometimes heard clearly more than a hundred miles from the battlefield! Charles D. Ross examines the acoustics of six Civil War battles and the unusual role they played in determining command decisions, and inevitably, the outcome of the war."--BOOK JACKET.