The Death Zap blog offers a set of free wargames rules for small unit combat. There’s also a fun battle report that goes with them.
rules
Scum of the High Seas Pirate Rules
Scum of the High Seas is Rudi Geudens set of hex-based. card driven rules for playing games of Pirates on the high seas. Like others in this series, they’re based loosely on Richard Borg’s Battle Cry system.
Quests of Heroscape
Quests of Heroscape adds a new element to the basic Heroscape game. In it, a victory is achieved by completing a series of random quests. The rules include some professionally done quest cards.
Honor and Glory Civil War Rules
Honor and Glory is a set of rules for the American Civil War for games where the smallest tactical unit is a regiment, which is represented by four bases. It’s playable in nearly all figure scales. Originally available on the Yahoo Groups, I have archived the files there because Yahoo Groups is shutting down.
Simple Colonial Wargaming Rules
Robert Cordery offers “Simple Colonial Wargaming Rules.” He writes
SCWaRes � pronounced “squares” � began life as a simple set of �fast play� rules for use with teenagers who had never played a traditional figure wargame before. The design parameters were: To have a turn sequence that kept the players involved throughout each turn; To have simple morale systems that dealt with unit and formation morale; To reduce the measuring of movement and weapon ranges to zero; To have simple systems for resolving fire combat and close combat; To include an element of uncertainty into the outcome of each game To produce a game that could be played to a conclusion in about an hour.