The Illiad is the story of the anger of Achilles — an unstable Greek warrior, filled with rage, who refuses to fight any more. Ostensibly, this is because his commander Agammemnon has taken Achilles’ slave girl. But one might also guess that Achilles has become totally burnt out on the fighting and just wants to stay in his tent and try to get a handle on his emotions.
See _Achilles in Vietnam: Combat Trauma and the Undoing of Character_, and _Odysseus in America: Combat Trauma and the Trials of Homecoming_, by Jonathan Shay, M.D.