War Telegram Marking Map.
War Telegram Marking Map. Produced by Prang in 1862, this War Telegram Marking Map was published for sale with the intension that telegraph communications within what the map calls ‘Virginia Territory’, the area running from Baltimore to Petersburg across the Union and Confederate line, would me marked down. The explanation key on the map comments that red and blue pencils would be provided alongside the map so that Union telegraph communications could be marked in red and Confederate communications in blue. This map is unmarked. L. Prang & Co.