Heroes of Chaos 2: Restarting the Story

Quote 1

If you're new, or have forgotten, every now and then I have two chapters set aside for reader feedback. In the form of a quote from any of Rick Riordan's Percy Jackson Books.

Here are the rules:

I won't post another chapter until the quote is answered correctly.

First person who attempts to answer whether the answer is correct or not gets the next chapter dedicated to them.

First person who answers correctly gets to choose any already written chapter to be dedicated to them. As long as the chapter is not already dedicated to someone else.

And here's the quote:

The last thing they needed as they _____ a magical Greek _____ into a potentially hostile _____ camp was a middle-aged _____ in gym clothes waving a _____ and yelling "_____!"

Fill in the blank and tell me what book it's from.

Good luck!