In the afternoon of Sept. 30-1942, position 51 55N 39 02W, when on a voyage from Liverpool to New York, Oregon Express reported being chased by a U-boat and again 3 hours later further west.
[www.warsailors.com]
(I just updated the page so it may be necessary to reload to get the latest - as always, corrections are encouraged).

Any guesses as to which boat this could have been?

Regards Siri
(warsailors.com)