What's that movie about rabbits? Its a cartoon, the rabbits are at war with other rabbits, its kinda gruesome.?

I don't remebert his movie! But I remember seeing it on TV a long time ago. The only scene I remmeber is a part with a rabbit about to die; he had just come back from fighting and his other rabbit friend was with him when he actually died. I think there was blood, but I'm not 100% sure. I know it sounds very odd, but I so rememebr this!!!