Capture the Flag

The campers in Camp Half-Blood play Capture the Flag using real swords, armor, magic weapons, etc. This activity is a long tradition and is held every Friday.

When playing Capture the Flag, the Campers go into the forest, where all the monsters are. It is a fairly dangerous game, but it is beneficial in that it provides real life training that they will need to survive in the world. All magic items are allowed in this game.

There is a flag on each side of the forest. To win you need to bring your opponent's flag across the border (the river that is in the middle of the forest). The flag must be visible.

Chiron serves as battlefield medic and referee.

In The Demigod Files, it is revealed that there is a Capture the Flag jail.

According to traditions, whenever the Hunters of Artemis visit the camp, a friendly game of Capture the Flag game will be held (the Hunters had won the last 56 games, much to Chiron's and the campers dismay).

Rules

 * The creek is the boundary line.
 * The entire forest is fair game.
 * All magic items are allowed.
 * The banner must be prominently displayed, and can have no more than two guards.
 * Prisoners may be disarmed, but may not be bound or gagged.
 * No killing or maiming is allowed.(the least followed rule since the only punishment is loss of dessert, as revealed in The Lightning Thief)
 * Guards aren't allowed to stand within ten yards of the flag

Matches
There have been only 3 known Capture the Flag games, once in The Lightning Thief, once when the Hunters of Artemis visited in The Titan's Curse, and finally once in The Demigod Files.

The Lightning Thief
After Percy doused Clarisse in the toilet, Annabeth exclaimed that she wanted Percy in the Capture the Flag game later on, probably becase she knew that Clarisse would want revenge.

During this game, the two teams were Athena, Apollo and Hermes (the latter were the two biggest cabins) VS Dionysus, Demeter, Aphrodite, Ares and Hephaestus (all the other cabins).

Percy was put on border control near the river, he was actually a diversion/bait for Clarisse and her cabin planned by Annabeth (the captain) earlier. The plan worked and Luke grabbed the flag. A hellhound appeared after the game ended and attacked Percy, leading him to be claimed by Poseidon.

Film
During the movie Annabeth and Percy duel at the site of the red flag. Annabeth defeats Percy, but Percy then goes to the stream and the water heals his wounds and helps him defeat Annabeth and all of the rest of the red team.

The Titan's Curse
When the Hunters of Artemis visited Camp Half-Blood, as per custom, a friendly capture the flag game was played. Team Camp Half-Blood comprised of the members that were at camp during that time, Percy, Thalia (they were co-captains), Charles Beckendorf and two other Hephaestus members, a few Ares campers, the Stoll brothers and Nico from Hermes, and the Aphrodite cabin.

Camp Half-Blood took the West Wood while the Hunters took the East Wood, it was agreed that Percy would play defence at Zeus' Fist, while Thalia would go and capture the flag. Thalia sent Silena as a decoy, while she led the main party, Percy saw an opening and ran for the flag, he managed to grab the flag and flit past Bianca who was the guard. Thalia caught and was very angry, meanwhile Zoe also managed to get their flag and when Percy was one meter away from the river she passed and tripped him in the process. The Hunters won for the 56th time, Thalia and Percy were blaming each other for the loss when the Oracle came outside and gave Zoe a prophecy.

The Demigod Files
There was a capture the flag game in "The Bronze Dragon", Charles got into trouble and Percy, Annabeth and Silena had to save him. At the end Annabeth asks Percy out for the Fourth of July fireworks.

The Lost Hero
In The Lost Hero, a child of Ares complains about not being able to play the game, due to the bronze dragon Festus being loose in the woods.