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The Second Demigod Civil War is the second known time in American history that two different groups of demigods, Greek and Roman, fought each other.

Origins

Immediately after the Second Titan War, Gaea began waking, with plans to resurrect each of her Gigantes children. The goddess Hera saw this as a threat, and pulled Jason Grace and Percy Jackson out of their respective camps and placed them into the other's, wiping their memories in the process. Jason quickly gained the trust of Camp Half-Blood when he led a quest to save Hera from imprisonment in the Wolf House.

Nearly six months later, Percy made his way to Camp Jupiter and embarked on a quest to save Thanatos. When he returned, he was proclaimed as praetor; however, several campers opposed him, mainly the Augur, Octavian. Leo Valdez flew the Argo II over Camp Jupiter to gather the six other demigods, according to the Prophecy of Seven.

Battles

Battle at Camp Jupiter

While the crew of the Argo II dined in Camp Jupiter, Leo gave Octavian a tour of the ship floating above the forum. An eidolon was possessing Leo without his knowing about it and caused Leo to fire on the Roman camp. The Romans were quickly stirred up into a frenzy, and the seven heroes of the prophecy barely escaped. However, the campers continued to chase the seven, sending eagles to track them.

Battle of Charleston

When the seven were in Charleston to look for a map, Roman commanders attacked and outnumbered the seven nearly three to one. Annabeth Chase ran into Reyna midway through the battle, who warned Annabeth that if the seven were to sail to the Ancient Lands, then the Romans would march on Camp Half-Blood in retribution instead. Annabeth did not comply with the threat, and sailed east to Europe and Rome, leaving the Romans behind.

March to Camp Half-Blood

Over the next days, the Roman troops made progress towards the Greek Camp, as Reyna had learned the location of the Camp from Annabeth Chase, who had told her the location during their negotiations. The last they were seen was at Central Park in New York City. While stationed in New York City, Rachel Elizabeth Dare and Grover Underwood met at the top of the Empire State Building to discuss the possibility of a truce with Reyna and Octavian. Rachel handed Reyna the note that Annabeth Chase had sent from Tartarus, asking that Reyna bring back the Athena Parthenos so that peace could come between the two camps. Octavian also read the note and believed it to be a trap or some kind of trick the Greeks were playing.

Reyna at first thought this was some kind of distraction as well because the battle with the Gigantes was being fought in Greece. However, Grover explained that despite the fighting taking place in Greece, Gaea was the earth itself and when she awakened, she would be everywhere, not just in the ancient lands. Reyna considered this and agreed to fly on Scipio to meet with the crew of the Argo II and retrieve the statue, which left Octavian in command. She ordered Octavian not to attack Camp Half-Blood until her return, but of course, Octavian began planning an attack the second she left, as she was the only one holding Octavian back.

Siege of Camp Half-Blood

Reyna, Nico, and Coach Hedge embarked on a quest to return the Athena Parthenos to the Greeks in a desperate attempt to stop the war. Reyna was outraged that Octavian had declared himself Pontifex Maximus, which was equivalent to a Roman Emperor. Her dreams further informed her that Octavian had hired former legionnaires banished from the Legion for criminal activities, which included the psychopathic Bryce Lawrence.

As the events progressed, Frank and Hazel found out from the goddess Artemis about the incoming battle. Octavian had summoned monstrous mercenaries like Cyclopes, two-headed men, Cynocephali, and Centaurs, oblivious to the fact that they would turn on him after the battle. Octavian had also commissioned the Cyclopes to build six onagers, designed to hurl projectiles of massive explosive power.

Reyna, Nico, and Coach Hedge eventually reached Long Island Sound with the help of Pegasus, Blackjack, and six other pegasi. While they were on a yacht, Michael Kahale, Dakota and Leila came to arrest them but were stopped by Tyson and Ella who arrived with the help of Rainbow the hippocampus. Dakota and Leila, who were loyal to Reyna, changed sides as they had always planned, and they headed back to the Roman camp with Nico to gather their Cohorts and stand against Octavian while Nico tried to sabotage the onagers.

Before the battle could begin, Nico, Will Solace, Lou Ellen Blackstone and Cecil Markowitz sabotagedbthe onagers, causing their shots to detonate each other when they were fired, but it nearly started a war when it angered the Greeks. However, Will used a piercing whistle to stun both sides long enough for Reyna to arrive and order a ceasefire by presenting the Athena Parthenos. The presentation of the Athena Parthenos healed the rift between Greek and Roman gods and demigods, but Gaea awakened at that moment and her monsters attacked. With the rise of Gaea and the return of the Athena Parthenos, the Greeks and Romans put aside their differences and stood together against Gaea, who was destroyed by the efforts of Jason Grace, Piper McLean, Festus, and Leo Valdez. Octavian also fired an onager shot at Gaea that possibly helped but also resulted in his death.

Finally, Camp Half-Blood and Camp Jupiter made peace with each other, and Jason introduced new programs to strengthen the friendship while taking up the title Pontifex Maximus himself to honor all the gods after a promise to Kymopoleia. The two sides were also now able to visit each other's camps at will.

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