Kamfen din Alexander Nevsky na 1242 akan masu mamaye Jamusawa da Estonia shine babban batun Littafin 4, gami da ƙarshen
Yaƙi a kan kankara. Baba Yaga na almara yana taimaka wa jaruman kare Kievan Rus '. A cikin Littafin 5, aikin ya canza zuwa Albigensian Crusade akan Catharism, da kuma kewaye da 1244 na Château de Montségur.