from the British ship RMS ''Trent'' in 1861 and later released. He was the older brother of Alexander Slidell Mackenzie, a U.S. naval officer.

Early life

He was born to merchant John Slidell and Margery née Mackenzie, a Scot. He graduated from Columbia University (then Columbia College) in 1810. In 1835, Slidell married Mathilde Deslonde. They had three children: Alfred Slidell, Marie Rosine (later

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