As the Revolutionary and Napoleonic Wars progressed, Andrew Roberts explains (in Napoleon: A Life), the casualty rates in battles increased:
At Fleurus they were 6% of the total number of men engaged, at Austerlitz 15%, at Eylau 26%, at Borodino 31% and at Waterloo 45%.
This was partly because with ever-larger armies being raised, battles tended to last longer — Eylau was Napoleon’s first two-day engagement since Arcole; Eggmühl, Aspern-Essling and Wagram in 1809, Dresden in 1813 were also two and Leipzig in 1813 went on for three — but mainly because of the huge increase in the numbers of cannon present. At Austerlitz the ratio was two guns per thousand men, but by Eylau this had leapt to nearly 4, and at Borodino there were 4.5. Eylau therefore represented a new kind of battle of the Napoleonic Wars, best summed up by Ney at its close: ‘What a massacre! And without any result!’
Artillery is known as the king of battle, infantry the queen. Why? Because artillery f$cks the infantry at every opportunity.
The king puts the balls where the queen wants them.