Signal flags played a significant position in verbal exchange at some stage in battles; they allowed comm

https://travismqdt216.zenbloomer.com/posts/craftsmanship-in-focus-the-art-of-making-reenactment-quality-civil-war-flags

Signal flags played a critical role in communique at some point of battles; they allowed commanders to relay orders over lengthy distances while verbal calls have been ineffective on account of noise.