Clark-Hall returned to service during the Second World War after volunteering to serve with the Royal New Zealand Air Force.

1 Wing Royal Naval Air Service conducting surveillance and attacks on enemy shipping from St Pol-sur-Mer, Dunkirk between September 1916 and November 1918, and was awarded the Chevalier of the Legion of Honour for his services to the war in February 1919.

[1] At the outbreak of the Second World War, Clark-Hall was in his late-50s, retired and living in New Zealand.

He volunteered to serve with the Royal New Zealand Air Force, and was granted a commission as a wing commander.

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