Congrats to @Moonstar_Flashstar for guessing the last cat! It was Tallstar! Here's the next one....

Fur of white,
Strange for my clan,
Died too young,
In battle.
Forced to go,
Not sure about,
My destiny.
They tried so hard to save me,
But I joined Starclan anyway.
Met ancient cat,
Hard as his name.
He told me of my clan mates,
I'd left that day.
Me and my siblings,
We're forced to go,
Forced to fight,
But my mother said no.
He took me away,
That monster of a cat.
Stepped into the battle field,
And that was that.

Who am I?

Poem credit to @Moonstar_Flashstar
It's a tricky one!!