On his way to the Vatican, he meets a gun-toting old lady called Nonna, who assists him with directions to get to the Vatican. They are successful, and Mikhail tells Sam that to find the location of the Grail, he needs to find a book inside the Vatican. Once back on base, Quinn informs Sam that they have been unable to reach Carter and Mikhail, so Sam and Rodriguez go back into Rome to rescue them. Sam and his friends manage to get out alive and head back to base. The HAARP activates, causing the volcano to erupt and fill the ruins of Pompeii with lava. Once setting up the beacons is complete, Brand orders that the HAARP be activated, despite Sam and his team not being a safe distance away from Mount Vesuvius. The team set up 8 beacons to activate the array, but Jones is killed during the mission by a Khnum. To find a way to get back into Rome, Sam and his companions retreat to a base in Pompeii, where they suggest utilizing the seismic capabilites of the HAARP complex to trigger an eruption on Mount Vevusius to erupt that will force Achriman's air forces to be grounded. Since the team have no other choice, they are forced to abandon the city. On the way to the Vatican, the convey is ambushed by enemy forces led by Lord Achriman, one of Mental's generals overseeing the invasion in Europe. According to him, the Grail is a powerful artifact inside the Ark of the Covenant that could be used to aid the human forces in their fight against Mental. Meanwhile in Rome, Italy, an Earth Defense Force convey carrying a unit of the EDF is sent by the Earth Defense Force to meet up with Father Mikhail, a priest and expert in archaic languages, who claims to have clues on how to find the Holy Grail. The Earth Defense Force, Earth's main military force, is scrambled along with local resistance teams to repel and contain the alien threat. Sometime during the Mental War, a massive portal opens in Tunguska, Russia, allowing Mental's armies to teleport to Earth. The Earth Defense Force convoy on their way to meet Father Mikhail.

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