Smoke

Interesting Fact

Before radios and phones, armies needed ways to communicate across long distances. ⚔️ Smoke could be seen from far away, so fire and smoke signals were used in various military contexts to convey information. Japanese castles and fortifications also relied on visual signals such as fires, flags, and bells. Imagine a samurai on a mountain seeing a huge column of smoke rising in the distance—the message had arrived without a single word being spoken.