just a note.
Using children as musicians was part of European military culture.
A statue (very centrally in Copenhagen) of one from the 3 year war in 1848-50. A civil war within the danish wholestate, that in 48-49 also involved Prussia and some of the smaller German states.
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Also of the 3 year war. In this case a musician in a "jäger" battalion
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The danish army was based on mandatory military service with the officers and cadre of NCOs being professionals... often serving basically for life. It was common for boys aged 12 (officially) to join as musicians, becoming corporals around age 16, and functioning as PT teachers and swimming teaches and similar.
And then often sergeants at 18-20.
And finally a few years later "commandersergeant" that where doing the exact same job as a LT, commanding a 50 man platoon.
And in the US the same was the case.
Augustus Meyers served for 10 years. Joining the Regulars army in the 1854 aged 12 and 8 month...
And later served in the regulars during the war.
www.gutenberg.org