I'd have 20, just in case:)
But while talking numbers it's important to note: NUMBERS give us enormous advantage.
If every patriot resolved that he is going to take out at least one bad guy, no matter what or how, any conflict would be over in a very short period of time.
That can be alongside the gas pump as they refuel, or as they dive through town, or stop for food.
It can be at 600yds from a checkpoint. It could be anywhere, anytime, anyhow.
If the bad guys lost 500 men in one day they would effectively surrender. If they lost 50 per day for a year...it would be regime change.