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|Union spotters were on Little Round Top, using signal flags. Confederate spotters would have used flag relays and mirror signalling. Even modern gunfire is line of sight without aerial or onsite spotting and communication, but this did not await radio communication. Confederate relays could have been set up along Seminary Ridge or, if taken, with Culp's and Benner's Hills. I believe there are records of Conferate signalling at Cedar Mountain in 1862, and I wonder if Lee's army had the capability of setting up telegraphic communication. I suppose they must have.