Good Night, Vienna
Max is an Austrian officer in the army and son of a highly placed general. His father wants him to marry a Countess but he has fallen in love with Vicki. Attending a party given in his honour, they are informed that war has broken out. Max writes a note to Vicki and goes off to war. Unfortunately the note is lost. Some time after the war, Max is just a shoe shop assistant while Vicki is now a famous singer. They meet and at first she snubs him but then falls in love with him again
IMDB: tt0022229