I saw a number of interesting parallels between this flick and Bruce Lee's Fist of Fury as both films were released in 1972. Most notable is that the plots bear some resemblance to one another and there is a strong sense of conflict between warning martial arts schools. Unlike Fist of Fury, however, the enemy, the Japanese, are portrayed in a flagrant, one-sided, racist, and xenophobic light; they are sometimes referred to as "Japs" by the main Chinese characters (I know this film is set before World War II - I wonder, did such racial epithets exist before then?).
Mao's character is really interesting because she's a pacifist torn between her belief in non-aggression and righting her enemy's wrongdoings. She displays her fighting skills in several scenes and she acts really well especially with her facial expressions.