Part of their problem was Percy. He fought like a demon, whirling through the defender's ranks in a completely unorthodox style, rolling under their feet, slashing with his sword instead of stabbing like a Roman would, whacking campers with the flat of his blade, and generally causing mass panic.
The Son of Neptune (Heroes of Olympus Book 2) (ed. Penguin UK, 2011) - ISBN: 9780141967554