Not only on the battlefield, but off? How did Alexander the Great get his men to move the way he wanted to, when they were seperated by 300+ yards and Persian soldiers. How did Augustus Ceaser manage to figure out things such as ambushes, how did they learn about the effects of battle?
Most of all, how did they do diplomacy? How did the leaders of 2 countries communicate with each other without them dying?
hi! this section of the FAQ* won't address all of your questions, but it can get you started on the topic of Greek & Roman battlefield communications
*see the FAQ link on the sidebar or the wiki tab