History spouseanon agrees the picture title is 1775, the year the fighting started. Lexington & Concord, spouseanon said the same thing.
The photo appears to be taken from a boat. There are 2 distant buoys on the water and a very distant shoreline. The horizon is slanted (like when a boat rocks). The flag is mounted from a slanted spar. I presume it's the dawn's early light and not the nightfall so the camera would be looking east so the water could be the Atlantic Ocean.