Chork's Puzzle 11

Difficulty Rating: 2

Once upon a time, there lived three little pigs. The three little pigs lived in the depths of a forest, where they each built a house of their own.

The youngest pig imported the finest straws from Australia, and built a snuggly straw house. The middle pig imported the sturdiest timber from Finland, and built a rustic timber house. The eldest pig, being the most practical, imported the best bricks from Italy and built a strong brick house.

The pigs had a merry time in the forest until a big bad wolf walked by their houses one day. Feeling nasty, the big bad wolf set their houses on fire, which instantly triggered the fire alarms of the houses. The fire alarm scared the wolf away, but also jolted the pigs awake from their beauty sleep. Seeing the blazing flames, they panicked and quickly phoned for help.

While waiting for help to arrive, the pigs tried to put out the fire on their own, but to no avail. The fire just seemed to get fiercer and wilder. At last, the pigs were delighted to hear the sounds of sirens. Aid had arrived! Leading the way was a police car, followed by an ambulance.

Which house did the ambulance try to put the fire out first?
If you know the answer, post it in the comments section of this post.