This a fun, high-energy culmination to teaching the U.S. Civil War, although it would work with any pre-modern war if you modified it slightly. The general idea is that the class is broken into 2 teams, and each student is assigned a chess piece. I have a chess board at the front of the room that represents reality, but that the students cannot see. Their team must set up their own chess board, then attempt to win a simple game (you must capture the king, not checkmate) by sending orders to the real board, and updating theirs accordingly. After a move, I announce which piece moved to which coordinates, and students have to adjust their boards to match the new intelligence. As the game moves on, I will purposefully misinterpret orders, ignore orders, and cause small shifts in the reality board that confuse their own boards until they figure it out.