Simplify the following text for a Grade 9 native English-speaking person.
Original: The first verifiable formal use of a brass horn as a military signal device was the Halbmondblaser â `` literally , `` half moon blower '' -- used in Hanover in 1758 .
Simplified: The first use of a brass horn as a military signal was the Halbmondblaser , meaning `` half-moon blower '' , used in Hanover in 1758 .