Older ships were occasionally beached to provide a coastal defence platform, and during the Battle of France the British discovered effective anti-tank artillery in the form of the four-inch (102 mm) guns from destroyers tied up at the quays of Boulogne.
During this period, four Army infantry and two Marine divisions were trained in amphibious warfare at the base and Brown became one of the pioneers in the coordination of naval gunfire, artillery, and air support.
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