Very well done Peninsular War story. Not really a Regency although set in that time of course. Instead of just having the hero home from the war, this story takes place mainly in Portugal and gives a clear picture of the trials that the Portuguese and Spanish people had to deal with during those war years. The love story was very believable. I loved the older hero who, while being an honorable Royal Marine, was a dandy and knew it, who was too old for the heroine and knew it and also knew that he could marry much better than an illegitimate girl and ignored all that and fell in love with the heroine anyway. The heroine was young but charming and strong. She was never TSTL and let the hero protect her while doing her best to take care of him. They both acted true to the mores of the times and even the extent of their physical love scenes all had a realistic rationale.
This was a story of people who lived in 1812 not the story of modern people dropped into the early 19th century as so many Regencies are these days.