How Did the 21-Gun Salute Come to Be?

In pictures: Gun salutes across the country mark King's birthday

21 Gun salute marks accession of Queen Elizabeth II to the throne

Here's Why The Military Does A 21 Gun Salute

Why does Trump want a 21 gun salute? Is that not for the dead

Gun History: Origin Of The 21 Gun Salute

Origins of the Twenty-One Gun Salute

King Charles's coronation to be marked with 21-gun salute and

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Military Archives, Page 12