There's some interesting speculation as to exactly how much malaria contributed to the victory at Yorktown. Cornwallis' troops had been operating in the South for many months, and thus their sick rolls were heavy with malaria cases. Washington and Rochambeau's troops, relatively recently arrived from New England, hand not yet begun to suffer heavily.BDK wrote:Disease[strike]The irregular fighting[/strike], TMK, caused the largest losses to the English - that, and we produced very little tax revenue for them, relative to the headaches we gave.
The colonial forces were adopting rifles as much as they could, I believe (my ancestors were part of the local junta that issues some orders to local rifle makers to sell all rifles to colonial forces.), but they weren't being mass produced at that time.
I have no idea if they were harder to use, etc - I know they were far more expensive and the colonial forces were pretty well broke
Until the invention of the Minie ball, more the 50 years after the War of Independence ended, rifles had an incredibly slow rate of fire, due to the ball having to be big enough to engage the rifling and thus having to be literally hammered into the barrel.
I'm not sure if the American armies could have made use of Napoleonic tactics effectively, for a couple of reasons. First, they didn't really have that many troops. A single one of Napoleon's corps would be far larger than the whole Continental Army, or even the largest single body of the British army in the colonies. Second, the Continental Army probably lacked enough trained and experienced officers to try to pull it off. The British Army's officers probably could have, if they had trained for those sorts of tactics - they were well trained, and many of them had experience in the Seven Years' War.
(Interesting trivia bit - the 'patron saint' of the U.S. Army Rangers, Robert Rogers, remained loyal to England, and led the troops that captured Nathan Hale. So it wasn't like the British Army didn't have men on in their ranks who didn't know light infantry tactics and irregular/frontier warfare.)