Me and Marlborough (1935)

There is a sort of version of the story of Mother Ross - see below - and I have seen it - made in the UK with Cicely Courtneidge it's not a spectacular being filmed on set throughout.

Image from here

Imdb writes

Set during the War of the Spanish Succession, this film is the story of newlyweds Kit Ross and Dick Welch, who are married at the beginning of the film. Immediately after the ceremony, Dick is forced to join the Queen's regiment of the army to help fight the French. Soon after Dick is whisked away, Kit follows him - posing as a young male soldier. Predictably, she turns out to be much more competent and intelligent than her male peers and often saves the day by her quick thinking. She eventually ends up in the company of the Duke of Marlborough himself, commander of the English forces, and finds favour with him because of her ingenuity - but all she wants is to be reunited with her husband Dick.