Started as a mystery. During the Second WW, anti-aircraft batteries which were raised in Canada were Light or Heavy. These were organized into regiments, but in Canada they were mixed in one regiment. The result was AA Regiments (as opposed to LAA and HAA reigments overseas). Not all batteries were brigaded in regiments and several were stand alone batteries, assigned to the air defence of certain strategic locations. For example independent AA units were assigned to defend the aluminum works at Arvida Quebec.
Which brings us to 40 HAA Bty. It was mobilized in early 1942, trained at Halifax, but then placed under control of the Commanding Officer, US Military District Sault Ste Marie Michigan. The Battery provided heavy anti-aircraft defence for the Sault locks until the close of navigation in 1943. The Battery was disbanded in December of that year.
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Res ipsa loquitur
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