Medical treatment (in a military hospital?)

Group portrayal in a room, probably in a military hospital, on the left at the side a row of camp beds / flatbed can be seen dimly, on the right in the picture a larger group of men around a chair, on which a man sits with a pain-distorted face and in a white heightened hospital shirt, all men look at the doctor (? ) as he cuts off the leg with a saw/a large knife at calf level, behind the doctor stand many men with hats, watching with interest, on the right at the edge in the foreground stand two men in military uniform and another gentleman with a hat, coat and beard, who are also watching from a suitable distance, at the bottom left various severed limbs can be seen under a cloth.