Signal flags played a integral position in verbal exchange all through battles; they allowed comm

https://landenfwmq676.alderbrief.com/posts/the-evolution-of-civil-war-flags-from-battlefields-to-modern-reenactments

Signal flags played a indispensable role in verbal exchange at some point of battles; they allowed commanders to relay orders over long distances when verbal calls have been ineffective by reason of noise.