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In page Tommy Atkins:

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A further suggestion was given in 1900 by an army chaplain named Reverend E. J. Hardy. He wrote of an incident during the Sepoy Rebellion in 1857. When most of the Europeans in Lucknow were fleeing to the British Residency for protection, a private of the 32nd Regiment of Foot remained on duty at an outpost. Despite the pleas of his comrades, he insisted that he must remain at his post. He was killed at his post, and the Reverend Hardy wrote that "His name happened to be Tommy Atkins and so, throughout the Mutiny Campaign, when a daring deed was done, the doer was said to be 'a regular Tommy Atkins'".