Or, the attacking team can have a greater number of people. A single flag is placed in the home area of the defenders. Perhaps let the referee choose a fair placement of the flag. The defenders are limited to a small area. They cannot stray from this area.
Attackers can go anywhere they want to after the start of the game.
Capture the opponents flag within the given time limit or eliminate your opponent. More fun indoors where action can happen close-quarters. If a president is shot, the team with the surviving president wins. The Teams start on opposite sides of the field. Each team has a president who is unarmed.