I've written about this frequently but I can't list all of my previous post. I'd recommend listening to the podcast I was in two weeks ago as I talk about the evolution of tactics up until the French Revolution.

However, as a result of the French Revolution and Napoleon, tactics change to a more static and linear method used by Frederick and the rest to that of mobile warfare that Napoloen (and earlier theorists) advocated. As a result of what has changed, there is less dependence on precise training of the line but rather quick movement and decision by the commander. With that change, it means that cavalry is more important since it is used to exploit breakthroughs and artillery is given more importance because artillery helps support both arms to create these breakthroughs.

The difference between the two is that of speed. Linear warfare before the French Revolution was slow and precise; after the Revolution, it because quick and deadly. To this day, we still use Napoleonic tactics, just with different weapons, tanks instead of horse cavalry, long range artillery instead of cannons, fast moving infantry instead of lines or columns of infantry.