He was educated at Windermere College, and entered the Royal Military Academy, Woolwich, second in the list of successful candidates, at the early age of seventeen.

[1] Henn, already wounded in the arm, successfully covered the operation with his handful of men, firing volleys upon the crowd of Ghazis pouring down upon them.

Henn then fell steadily back, carrying the wounded Blackwood, and following the line of retreat of the 66th Regiment across the nullah to a garden on the other side.

Around the spot were afterwards found, lightly buried, the bodies of Henn and fourteen sappers, forty-six men of the 66th Regiment, and twenty-three native grenadiers.

[1] In General Primrose's despatch of 1 October 1880 he describes, on the authority of an eye-witness—an artillery colonel of Ayub Khan's army—the gallant stand made by this little party.