In the battle of Spacerock between Sylvia and Artemis, Artemis had twelve Knights in her stack who engaged in battle with a stack of red dwagons and green dwagons and then with Lady Sylvia's stack which consisted of purple dwagons as well as Captain Archer.
The names of these knights were:
Real World References
All of the knights are named after various brands of dog food. Artemis is also such a brand.
That Nutro is a gladiator-class knight is probably a reference to the character Nitro from the television show "American Gladiators".