The term 'knight fights' refers to the medieval sport of JOUSTING, which was a popular form of combat between two knights on horseback. JOUSTING involved two knights charging at each other with lances in an attempt to knock the other off their horse. The crossword solutions for this term are 'JOUSTS' (6 letters) and 'JOUSTING' (8 letters). JOUSTS were tournaments in which knights competed against each other in JOUSTING matches, and JOUSTING was the actual act of competing in these tournaments.