Winner: @iiCuriousCat
Correct Answer: Mistyfoot/star

~~~
I had been an influence to ThunderClan,
But when I lead a patrol, disaster struck.
That RiverClan, came pouring down on us, the deputy,
Pounced... Rocks... Tumbled,
Killing him with one blow.
Tiger attached himself towards I,
Sinking his sharp teeth into my neck.
~~~

I edited it a little bit, sorry, I'm a grammar nazi
~Night