Painting on copper sheet
 

Tell me something about the picture. Left over from his grandfather. On the copper sheet. On the back side sealed with black paper. Initially, it seemed, was built into the wall, the stucco ornament. Maybe the gun will tell the time and place.

Obviously, Central or Southern Europe, 20-40-s 19 th century.

What a story, a mystery.

Balkan rebel over the Danube?

I recalled this story in the Christian period of separatism (Balkan, Slavic) provinces of the Ottoman Empire. Some war in Montenegro in 1862 th year. Or in general insurrection in Crete in 66-m. And here and there the mountains and the rebel detachments (as one would say in today's Russia, the illegal armed groups, bandits, etc.).
A possible late story: in 1875 an uprising began in Herzegovina, Bosnia and Bulgaria.
But the mood of the characters in the movie, the action itself on it is up to the Russian-Turkish war of 1877-1878. They've gone on other subjects: "lads", Shipka, Skobelev, Gurko!

That seems to me that the deadline for the painting - 1860.