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Caligula’s Assault on Camp Jupiter is a series of attacks on Camp Jupiter by Caligula. The first wave of the attack, which happened during a new moon was fended off by the Roman demigods and legacies, with additional help from Leo Valdez. However, their camp was in ruins and they suffered heavy casualties. When Caligula heard that his assault had failed, he ordered a second one and headed to the camp himself.

The Trials of Apollo

The Dark Prophecy

The attack is forewarned by Meg McCaffrey through the Oracle of Trophonius. When they learn that the attack will take place in five days, on new moon, Leo Valdez volunteers to fly to San Francisco on Festus to warn them.

The Burning Maze

In Apollo's dream, Python tells Nero that he was aware that Camp Jupiter had been warned of the attack. While the assault is not shown, Caligula receives news from Flange, the Pandos, that the attack failed, kills him and orders his ships to sail north to the Bay Area.

Later, Leo and Festus arrive at a private airfield in Santa Monica and tell Apollo, Meg, Piper McLean and the Hedges about the attack. He says that the Romans suffered heavy losses and the camp suffered a lot of damage. However, he mentions that some of the survivors are Frank Zhang, Reyna Ramírez-Arellano and Hazel Levesque.

The Tyrant's Tomb

Frank Zhang recounts the battle with Apollo, saying that hundreds of monsters and the undead attacked them. They only stopped when they reached the Little Tiber, as the dead are deterred by fresh water. He says that some of their dead are missing and that they fear they will be turned on the legion.

The second wave of the assault is referred to as the Battle of San Francisco Bay.

The Trials of Apollo
Core Series: The Hidden Oracle | The Dark Prophecy | The Burning Maze | The Tyrant's Tomb | The Tower of Nero
Main Characters: Apollo/Lester Papadopolous | Meg McCaffrey | Peaches | Leo Valdez | Calypso | Grover Underwood | Piper McLean | Reyna Ramírez-Arellano | Frank Zhang | Hazel Levesque | Nico di Angelo | Will Solace | Rachel Elizabeth Dare
Secondary Characters: Percy Jackson | Chiron | Austin Lake | Kayla Knowles | Hemithea | Josephine | Georgina | Lityerses | Trophonius | Gleeson Hedge | Mellie | Chuck Hedge | Medea | Jason Grace | Herophile | Crest | Lavinia Asimov | Don | Tyson | Ella | Tarquin | Luguselwa | Claudia | Janice | Blaise
Minor Characters: Sally Jackson | Thalia Grace | Mrs. O'Leary | Festus | Cade | Mikey | Harley | Connor Stoll | Miranda Gardiner | Cecil Markowitz | Ellis Wakefield | Sherman Yang | Damien White | Malcolm Pace | Paolo Montes | Valentina Diaz | Germani | Agamethus | Olujime | Phillip McCaffrey | Hunter Kowalski | Sssssarah | Prickly Pear | Aloe Vera | Joshua | Naevius Sutorius Macro | Incitatus | Tristan McLean | Bombilo | Aurum | Argentum | Julia | Jacob | Poison Oak | Screech-Bling | Annabeth Chase | Elon | Mamurius Veturius | Mimi
Olympian Gods (Greek & Roman): Zeus/Jupiter | Hera/Juno | Poseidon/Neptune | Demeter/Ceres | Ares/Mars | Athena/Minerva | Apollo/Apollo (Roman) | Artemis/Diana | Hephaestus/Vulcan | Aphrodite/Venus | Hermes/Mercury | Dionysus/Bacchus | Hades/Pluto
Minor Gods: Nero | Commodus | Caligula | Iris | Britomartis | Styx | Terminus | Lupa | Terpsichore | Harpocrates | Cardea
Titans: Rhea | Leto | Mnemosyne | Helios
Monsters and Magical Creatures: Python | Nosoi | Karpoi | Palikos | Myrmekes | Colossus Neronis | Blemmyae | Gryphon | Carthaginian Serpent | Scythian Dracaena | Cynocephali | Centaur | Cyclops | Yale | Satyr/Faun | Strix | Dryad | Dragon | Pandai | Eurynomos | Skeleton Warriors | Zombie | Raven | Amphisbaena | Troglodyte | Tauri Sylvestres
Related Content: Rick Riordan | Percy Jackson and the Olympians | The Heroes of Olympus | Demigods & Magicians | Camp Half-Blood Confidential | Camp Jupiter Classified: A Probatio's Journal | Percy Jackson Demigod Collection | Un Natale Mezzosangue