I'm doing the changing nature of warfare also, 1792-1918. I've practically summarised my textbook and have split up the each period with the wars in the order they took place.
Revolutionary, Napoleonic, Crimean, Solferino (Italian War of Unification), German Wars of Unifications, Russo-Japanese and then World War 1.
I've not really focussed on the American Civil War too much as it's an optional area of study.