1866 September 8, Carl Schurz, The Logical Results of the War, speech delivered at National Hall in Philadelphia, Pennsylvania, this version recorded in 1913, Frederic Bancroft (editor), Speeches, Correspondence and Political Papers of Carl Schurz, Volume I,
We have already heard the triumphant morning gun of Vermont, booming with increased volume. Far off San Francisco has merrily responded; old Maine in the North stands ready to send us a cheering echo, and all over the land our hosts are mustering with the inspiring confidence that to march on is to conquer.

Morning gun

Meaning

Noun