German surface raiders in ww2

[Ross1988]

I'm looking for information on a world war 2 german surface raider, disguised as a merchant vessel.

Just as a passing interest, There's a particular ship I'm after, but for the life of me i can't remember It. If someone good remind me of the names of some of the particulary successful ones, I'd greatly appreciate it.

Cheers

[Ross1988]

Thanks everyone!