During the Revolutionary War, there is shown that whistles (hand held, blown my mouth) that were used to impart commands to the troops. Here is a link I found about this subject: http://www.northernbrigade.org/documents/whistle.html
Question, is there any information, documentation, etc dealing with the use of whistles during the CW to transmit or impart commands to the troops?? During my googling, all I can come up with is the sale of such whistles. Thanks
JIM T