On June 24, 1861 The New-York Times reported about 9th Regiment Massachusetts Volunteer Infantry, which, it was reported, was composed chiefly of Irishmen. It’s commander was Colonel Thomas Cass. The regiment trained on Long Island in Boston Harbor. After a collation provided by the city of Boston, the regiment was going to be reviewed on the Common. The Times reported that the regiment was going to depart for Fortress Monroe. At some point it ended up at Camp Cass around Arlington.
According the Wikipedia link the Ninth originally bivouacked at Boston’s Faneuil Hall. Colonel, who was born in Ireland, died from wounds received at Malvern Hill in July 1862.
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That drummer boy/altar boy looks so young.