Mousewhisker was tricked, along with Ivypool, Birchfall, and Blossomfall, into believing that the strange warriors in her dreams wanted to help her become a better warrior. She trained hard, and was very grateful for these skills, never questioning why she would need them. Little did she know that the warriors that were teaching her were slowly earning her trust, hoping she would be loyal to them in the end, which she was not. Like many of the other cats that were tricked, she fought on the side of the clans when the final battle came. The Great Battle cost many cats lives, and Mouswhisker couldn't believe what she had conquered. She was glad she had not made the wrong choice, and her injuries reminded her to look before you fall, no matter what.