Bugle
The first use of a brass horn as a military signal was the Halbmondblaser, meaning "half-moon blower", used in Hanover in 1758. It was U-shaped (this is where its name comes from) and easily carried with a shoulder strap. It first arrived in England in 1764 where it was slowly it became used often by foot soldiers. Cavalry did not normally use a proper bugle, but instead used an early trumpet that made a sound which was easier to hear from nearby, but travelled less far.