To sound the charge

to give the signal for an attack.

See also: Charge

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References in periodicals archive ?
The Balaklava Bugle was used to sound the Charge of the Light Brigade on October 25, 1854 - part of the most famous battle of the Crimean War fought against Russia on the shores of the Black Sea.
Having gone over the top when the whistle blew to sound the charge, dad was wounded, having come under enemy artillery fire from shells.
On July 1, 1916, Private Clay used it to sound the charge as 703 of the 8th Battalion York and Lancaster Regiment leapt from their trenches.