He became a colonel in the Indian Army and was a naturalist interested in the birds and butterflies of India.
Marshall retired from the Royal (late Bengal) Engineers in November 1897.
[1] Marshall married Elizabeth Huntley Muir (1851, Agra - 1913) at Allahabad in 1874.
One son George Leycester Knox (born 1875) died young at Simla on 20 July 1883.
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