Ninety-nine members of the 2nd Battalion of the Royal Norfolk Regiment who had surrendered to his unit in a cattle shed were stood in front of the barn wall, and Knöchlein ordered two machine-guns turned on them, followed by bayoneting and shooting any apparent survivors.
He did military service as an officer in the Royal Norfolk Regiment of the British Army, serving in Germany and India.
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Hotblack was commissioned into the Royal Norfolk Regiment in 1915 and served in the First World War as an intelligence officer in France before transferring to the then "Heavy Branch" of the Machine Gun Corps (later the Royal Tank Corps) in 1916.
At the beginning of the 20th century it was used by the Royal Norfolk Regiment as the cavalry training ground.