You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you will be shown an extract from a movie plot and a question. You need to provide the correct answer for it. Short answers containing words that are present in the passage are preferred.

Twenty-year-old Will Hunting of South Boston is a self-taught, genius-level intellect, though he works as a janitor at the Massachusetts Institute of Technology and spends his free time drinking with his friends, Chuckie (Ben Affleck), Billy (Cole Hauser) and Morgan (Casey Affleck). When Professor Gerald Lambeau (Stellan Skarsgard) posts a difficult mathematics problem as a challenge for his graduate students, Will solves the problem anonymously, stunning both the graduate students and Lambeau himself. As a challenge to the unknown genius, Lambeau posts an even more difficult problem. Lambeau chances upon Will solving the problem but Will flees the scene. That night at a bar, Will meets Skylar (Minnie Driver), a British student about to graduate from Harvard, who plans on attending medical school at Stanford and gives Will her phone number before leaving., Question: How old is Will Hunting in the movie ?
Solution: Answer: Twenty years
Why? This is a good example which results in a factoid answer.

New input: A notorious diamond thief and two dim-witted accomplices stop along the highway where 12 year-old Owen sees them mistreating their dog. The boy intervenes to give the thirsty dog a drink, but it escapes into the woods. He helps the angry thugs search for the animal deep into the forest, then ditches them. Owen finds the dog and they hide out in his secret fort, ingeniously fortified with booby traps and defense mechanisms to repel intruders. Bravely, his fort is built atop the ridge where the feared "Madman of the Mountain" is said to live.Desperate to retrieve their $5 million in stolen jewels stashed on the dog, the thugs catch up with Owen, and a terrific battle ensues. Can one kid with a tricked-out fort protect an animal from three determined thieves? And is the legendary Madman of the Mountain real? Kids of all ages will delight in the fast-paced action and comedy this heart-warming tale delivers.Starring French Steward ("3rd Rock from the Sun" (1996), Home Alone 4 (2002) (TV)), Kevin P. Farley (The Waterboy (1998)), Kelly Perine ("One on One" (2001)), Luke Benward (How to Eat Fried Worms (2006)) and Brittany Curran ("The Suite Life of Zack and Cody" (2005)), "Diamond Dog Caper" is slap-stick fun for the whole family.*source: Synopsis on the Official Site: [url], Question: The defense mechanisms were meant to repel whom?
Solution:
Answer: Intuders