Poles were quite effective cavalry men with a well established traditions. Polish cavalry would make short work of Cossack in a pitched battle. Their abuse of Jews should be treated in a manner similar to the KKK.
The film is an insult to the Poles and Jews of the region. Although Yul Brynner and Tony Curtis make the film watchable it should be treated as a farce. If you are a fan of either it is the only reason to watch this film.