From 1854 he served as a Lieutenant in the 41st Battalion Welsh Regiment in the Crimean War.

[1][2] Promoted to major general in December 1889,[3] he retired to 43 Manor Place in Edinburgh's West End.

Their son Major William Louis Campbell Allan (1871–1914) was killed near Bethune in the opening months of the First World War.

The portrait is held by the Welsh Regiment Museum at Brecon Beacons.

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