I was attacking hte Altarian Homeworld today, and one of their ships, a cruiser, had some riciculous D. He had 10 defense against my lasers, and had missles that inflicted 3 damage. To make a long sotry short, he was able to singlehandedly destroy a fleet of 3 of my medium class ships! Virtually every attack from me was for 0 damage.

Oddly enough, when I left the battle viewer, my ship was still there (the last one wasn't completely killed when I left) and his cruiser was gone.