Little Women II - Jo's Boys Episode 13 released!

Mr. Bhaer did not approve of fighting, and did not think it a proof of either manliness or courage for two lads to pommel one another for the amusement of the rest. All sorts of hardy games and exercises were encouraged, and the boys were expected to take hard knocks and tumbles without whining; but black eyes and bloody noses given for the fun of it were forbidden as a foolish and a brutal play.

Dan laughed at this rule, and told such exciting tales of his own valor, and the many frays that he had been in, that some of the lads were fired with a desire to have a regular good "mill."

- Little Men, Chapter 6

In this episode, Dan continues his mistrust towards various residents of Plumfield.  However, when he claimed that Jo had ulterior motives for being kind, Emil takes exception and calls Dan out to a fight, contrary to the school rules. (Granted, Emil is probably one of the few people living there who could probably break that rule and get away with it.)