The Citadel
Starring Robert Donat, Rosalind Russell, Ralph Richardson, Rex Harrison, Emlyn Williams, Penelope Dudley-Ward, Francis L. Sullivan, Mary Clare, Cecil Parker, Nora Swinburne
It's a drama and romance movie, and has a rating of 7.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Belgium.