Could a clan of Warrior Cats (one clan not all four) beat the Jellicle Cats from Cats the Musical (not the movie) in a battle to the death.
On one hand, the Warrior Cats have a leader with nine lives, magic, the ability to see the future, and actual battle training to kill people. On the other hand, the Jellicles also have magic and the ability to see the future, and they can canonically command human vehicles (boats, trains, cars possibly). The warriors have more experience with fighting other cats, but the Jellicles have won a war against dogs, but only once a long time ago.
Assume that the Jellicles are not going to constantly reincarnate like in canon, and assume that the starclan/dark forest cats will not rise to fight, or the fight will just go forever. Once a cat dies, they are dead, unless they are a leader and have more lives.
With that being said: FIGHT!