I'm sure it's one of the "Usherforce" units.
HyperWar: The War in France and Flanders 1939–1940 [Chapter IX] Quote:
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Another party of gunners—of the 3rd Super-Heavy Battery—held the crossing at Watten against a German armoured reconnaissance battalion till they were relived late in the day by French infantry
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See this map.
http://www.ibiblio.org/hyperwar/UN/U...landers-14.jpg