As others have said - horse death is persistent throughout the movie, only during the battle scenes and immediate aftermath.
Some specifics that I remember.
The first one was, I think, the worst. I don't even like horses and it upset me. At the battle at Toulon (the first battle), right after Napoleon says something like, "Ready, boy?" to his horse and rides forward, the horse is struck in the chest with a cannonball and the chest explodes. Very gorey. After the battle, Napoleon retrieves the ammunition from the horse's open chest.
At the battle of Austerlitz (first wintery battle), horses and their riders are struck by cannonballs, and also fall into the frozen lake as the ice is broken up.
There was horse violence in the Battle of Waterloo (the final battle of the film) also but I don't remember specifically gorey scenes.
Mosquitos (possibly two scenes, one in Egypt and the other after Austerlitz?), barely visible except that the characters are swatting at them; and toward the end Napoleon fishes a dead fly out of his wine, it is shown close up.
I feel like there's at least one throat slitting scene during one of the battles. (Napoleon also nicks himself shaving but it is nothing close to mutilation.)
idk if this was the only but its the only one i remember, in the ending scene of the movie you see napoleon fall out of/collapse out of his chair that hes in from behind it
Voting no. Napoleon mentions being interested in marring a 15-year-old but it's for political reasons and she is not shown on screen. (Problematic for other reasons, but she is not sexualized in the movie.) He goes to bed with an 18-year-old, but she is just shown to be lying in bed, fully covered. His second wife was 19 when they married.
Napoleon is asked to sleep with an 18 year old girl to see if the infertility problems are with him or his wife Josephine. It’s not explicit, but it’s talked about and you see the girl in bed.
Theatrical version (not sure about the director's cut) there are sex scenes and VERY low cut dresses and other provocative scenes, but no nips or butts or anything like that.