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| 1940, Feb. 16 |
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| A British destroyer invaded Norwegian coastal waters to attack the German ship Altmark, which was attempting to reach Germany with British prisoners of war aboard. The Norwegian government protested to London. | 1 |
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| April 8 |
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| The British and French governments announced that Norwegian waters had been mined to prevent the transit of German ships. | 2 |
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| July 3 |
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| BATTLE OF MERS-EL-KEBIR. British naval forces destroyed part of the French fleet stationed at Oran to make certain the ships would not be available for the Germans. The French crews had refused to surrender. | 3 |
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| Sept. 2 |
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| Britain received 50 overage destroyers from the U.S. | 4 |
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| Sept. 6 |
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| The U.S. Congress passed a defense measure appropriating $5,246,000,000 and providing for 201 ships of war, seven to be battleships of 55,000 tons each. | 5 |
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