“Mount Tam,” Frank said. “Kids at camp are always talking about it. Big battle happened on the summit, at the old Titan base.”
Percy frowned. “Were either of you there?”
“No,” Hazel said. “That was back in August, before I—um, before I got to camp. Jason told me about it. The legion destroyed the enemy’s palace and about a million monsters. Jason had to battle Krios—hand-to-hand combat with a Titan, if you can imagine.”

The Son of Neptune, Chapter XVII