Absolutely insane that armies in the 21st century used to have radiomen.like hello yes we’re here to slaughter eachother but before that my main man DJ Oorah is gonna play nothing but rock, rock and more rock, this ain’t your granny’'s net Radioactive by imagine dragons starts playing

Drummers were used for communication, its impossible to hear someone shouting or see a flag/signal when hundreds of people are firing off black powder firearms.