[sc_rufctr]

The movie is based on the book "The Good Shepherd". The ship in the book was "Mahan-class destroyer".

And U Boats did engage ships on the surface. That's well documented.
Would they choose to engage two ships at once? Of course not but that wasn't their choice.

USS Kidd (DD-661), a Fletcher-class destroyer was used as the ship in the movie. Maybe that's the closest they could get to an appropriate WW2 ship? The only issue I had was the speed of the torpedoes. They seemed too fast but who knows?

How fast were German torpedoes in WW2?

The G7a(TI) was the standard issue Kriegsmarine torpedo during the early years of World War II. It was a steam-powered design, using a wet heater engine burning decaline, with a typical range of about 7,500 metres (24,600 ft) while running at 40 knots (74 km/h; 46 mph).

BTW: You're becoming entirely predictable.