Yojoe has always been able to help me find the names of obscure movies. I have another one.

I'm looking for the name of an animated movie I had on VHS in the early 90's. The movie might have been older than that, I don't know. It was a non fantasy set in the middle ages. The main character was a knight. I think he was either exiled or fled or something. At one point he secretly joins a joust tournament that he wins. At some point during the movie he is given a horn that he uses at the end to call for help during the final fight. The guys that help him are outlaws like Robin Hood's Merry Men. There is no Robin Hood, but I seem to think characters like Friar Tuck and Little John are among them. That's all I got.

The Black Arrow might be it. I just watched part of it and it is extremely similar. Though a few key details I remember, I didn't see.