▁the ▁Jud g ement ▁of ▁Paris , ▁the ▁ab du ction ▁of ▁Helen , ▁the ▁sacrifice ▁of ▁I ph igen ia ▁at ▁A ul is . ▁To ▁recover ▁Helen , ▁the ▁Gree ks ▁launched ▁a ▁great ▁expedition ▁under ▁the ▁overall ▁command ▁of ▁Men el aus ' s ▁brother , ▁Ag am em non , ▁king ▁of ▁Arg os ▁or ▁My c ena e , ▁but ▁the ▁Tro j ans ▁refused ▁to ▁return ▁Helen . ▁The ▁I li ad , ▁which ▁is ▁set ▁in ▁the ▁t enth ▁year ▁of ▁the ▁war , ▁tells ▁of ▁the ▁quar rel ▁between ▁Ag am em non ▁and ▁Ach illes , ▁who ▁was ▁the ▁fin est ▁Greek ▁war rior , ▁and ▁the ▁consequ ent ▁death s ▁in ▁battle ▁of ▁Ach illes ' ▁bel oved ▁com rade ▁Pat ro clus ▁and ▁Pri am ' s ▁el dest ▁son , ▁H ector . ▁After ▁H ector ' s ▁death ▁the ▁Tro j ans ▁were ▁joined ▁by ▁two ▁ex otic ▁al lies , ▁P enth es ile a , ▁queen ▁of ▁the ▁Ama z ons , ▁and ▁Mem non , ▁king ▁of ▁the ▁Eth iop ians ▁and ▁son ▁of ▁the ▁dawn - god dess ▁E os . ▁Ach illes ▁killed ▁both ▁of ▁these , ▁but ▁Paris ▁then ▁managed ▁to ▁kill ▁Ach illes ▁with ▁an ▁arrow ▁in ▁the ▁he el . ▁Ach illes ' ▁he el ▁was ▁the ▁only ▁part ▁of ▁his ▁body ▁which ▁was ▁not ▁inv ul ner able ▁to ▁damage ▁by ▁human ▁weapon ry . ▁Before ▁they ▁could ▁take ▁T roy