In the slowly dispersing powder smoke over the whole space through which Napoleon was riding, horses and men lay in pools of blood, singly and in heaps. Never yet had Napoleon or any of his generals seen such horror, so many men killed on such a small space. The roar of guns, which for ten hours had never ceased to torment the ear, gave the spectacle a special significance (like the music in tableaux vivants.) Napoleon rode out to the height of Semyonovskoe and saw ranks of men in uniforms of a color his eyes were not accustomed to. These were Russians.
from page 251-252, Volume 2 of original text
Pevear/Volokhonsky translation page 803-805