Not an attack to the rear…
Almost forgotten today, the Grand Salut was a rather elaborate sequence of movements that preceded each bout. A large percentage of 19th-century fencing photos does indeed depict the salute, not any competitive action.
Strangely enough, no Classical Fencer has uploaded a video of it on youtube yet.
There is no further information on the officers or the location of this image.
And there will be more, I promise.