The I class already carried ten torpedoes before the Tribal and J designs appeared. The Royal Navy ordered nine but received eleven after buying two of four destroyers ordered by Turkey. Wartime acquisition overrode the treaty restriction described in this comparison. An Argentine cruiser based on the Arethusa design, with nine 6-inch guns, supplies a counterfactual example: had she remained in Britain a few weeks longer, she would have been retained for Royal Navy use in this interpretation.
Chapter · 6:24-7:34
I-class torpedoes and wartime acquisition of export warships
The I class established the ten-torpedo battery, while two Turkish orders show how wartime acquisitions enlarged the Royal Navy's force.