It all started with a boomerang
"I already told you Aang. I'm going to find Sokka's boomerang." Katara said. Though Aang wasn't listening, he was chasing Momo, who was chasing a flying bug of some sort.
"Are you listening to me! Aang!"
"Oh what? Yea, you go into the woods to find Sokka's boomerang. What next?"
"You have to stay here to make sure Sokka doesn't go into the woods looking for me, Aang are you even listening?" 'Oh, forget it, I won't be long.' Not before long, she found the boomerang. But as she was about to turn around and go back to the campsite, she heard something in the bushes. She turned to look, but saw nothing, and thought it was just an animal. But then she heard three bushes at once!
Before she could do any water bending, she was tied up to a tree with three fire nation soldiers around her. She tried to break free, but the ropes were too tight.
Just then she heard someone say, " This better be a good reason to get me off my mission to capture the Avatar."