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  1. Battle of the Atlantic

    Two million gross tons of merchant shipping, 13% of the fleet available to the British, were under repair and unavailable, which had the same effect in slowing down cross-Atlantic supplies.

    Source Wikipedia (opens external site)

  2. Battle of the Atlantic

    With this, there was hardly any need to triangulate, the escort could just run down the precise bearing provided, estimating range from the signal strength, and use look-outs or radar for final positioning.

    Source Wikipedia (opens external site)

  3. European Theater

    THOR mission records show at least 133 Allied sorties (32 recorded unit missions) in the European Theater on 1941-09-13, flown by RAF. Targets included FRANCE.

    Source US Air Force THOR (opens external site)

    THOR is a secondary compilation with known gaps, not a complete record.

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13 September in other years 19391940194219431944

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