Excerpt: Alarm & Muster The Modern-Day Call-Tree for Emergency Preperation Thomas Michael Fernandez, January 2009 Months before the first shots of the American Revolution were fired; colonials had devised and developed what appeared to be a modern day "call-tree." Though communication during the 18th Century was limited to pen, paper, and horseback, the network they had set up prior to the night of April 18, 1775 was almost as modern as today's communication abilities of cell phone, email, and video.