
A naturalist, to obtain accuracy of observation, may confine himself in his observations to one limited period and I will take first that following the Austrian offensive of June, 1918, as one in which the dead were present in their greatest numbers, a withdrawal having been forced and an advance later made to recover the ground lost so that the positions after the battle were the same as before except for the presence of the dead.
Until the dead are buried they change somewhat in appearance each day. The color change in Caucasian races is from white to yellow, to yellow-green, to black. If left long enough in the heat the flesh comes to resemble coal-tar, especially where it has been broken or torn, and it has quite a visible tarlike iridescence. The dead grow larger each day until sometimes they become quite too big for their uniforms, filling these until they seem blown tight enough to burst. The individual members may increase in girth to an unbelievable extent and faces fill as taut and globular as balloons.
The surprising thing, next to their progressive corpulence, is the amount of paper that is scattered about the dead. Their ultimate position, before there is any question of burial, depends on the location of the pockets in the uniform. In the Austrian army these pockets were in the back of the breeches and the dead, after a short time, all consequently lay on their faces, the two hip pockets pulled out and, scattered around them in the grass, all those papers their pockets had contained. The heat, the flies, the indicative positions of the bodies in the grass, and the amount of paper scattered are the impressions one retains. The smell of a battlefield in hot weather one cannot recall. You can remember that there was such a smell, but nothing ever happens to you to bring it back.
The first thing that you found about the dead was that, hit badly enough, they died like animals. Some quickly from a little wound you would not think would kill a rabbit. They died from little wounds as rabbits die sometimes from three of four small grains of shot that hardly seem to break the skin. Others would die like cats; a skull broken in and iron in the brain, they lie alive two days like cats that crawl into the coal bin with a bullet in the brain and will not die until you cut their heads off. Maybe cats do not die then, they say they have nine lives, I do no know, but most men die like animals, not men.
Ernest Hemingway
“A Natural History of the Dead”


Wow, interesting.
Immersive too–I felt like I was there…