“Informed London sources said Saturday that the number of U-boats operating against Allied shipping is increasing despite the improved defense record of the last six months.”
increased u-boat presence in North Atlantic 1943
![Upsurge in [BR]U-Boat Patrols](https://oldmagazinearticles.com/pdf/1943-U-Boats_0001.jpg)
increased u-boat presence in North Atlantic 1943