Rebel Publishing offers “Two For Tea”, a set of fast play rules for the American War of Independence. I’ve tried them, and they work well.
rules
Seven Samurai Skirmish
Seven Samurai Skirmish is a set of free wargames rules for battles in the spirit of the classic Kurosawa movie Seven Samurai.
Victory Without Quarter English Civil War Rules
Victory Without Quarter is a set of free wargames rules for quick play English Civil War battles.
Tin Army In The Civil War
Tin Army In The Civil War is a set of free wargames rules for the American Civil War by Ross Mcfarlane. The author writes:
This is a simple set of wargame rules aimed at Division or Corps sized battles. They assume that low level tactics are being handled by regimental officers and their Brigadiers and by the dice. The game may be played on grid with 1 unit per grid area otherwise all distances are roughly equal to the frontage of a deployed infantry unit or roughly 150 yards. Units within that distance and directly in front of, behind or beside each other are deemed to be adjacent. Turns represent a variable length of time and overlap the previous and following enemy turns. 12 to 15 turns each is a good medium length game with a simple scenario and a dozen or so units per side.