Welcome aboard, monkeyman. We have a rule here that no one can start a new topic until they've made 10 posts. We've had some trouble with trolls in the past, and that's a way of keeping them off the board.
To answer your question, the short you're referring to is "Squareheads of the Round Table" (1948), and yes, Shemp is in it, along with Stooges regulars Christine McIntyre as the princess, and Vernon Dent as King Arthur. Jock Mahoney (Jacques O'Mahoney) plays Cedric the blacksmith, and the way this tall actor towers over the Stooges is funny just in itself. IMO, one of the best Shemps.