I've enjoyed others in O'Connor's "Olympians" series, including Hades
, and picked up several more from Barnes and Noble. This one deals with Ares, god of war, but starts out with an interesting compare-and-contrast between him and Athena, who's a dab hand at battle herself. The author describes Athena as the strategist, logical, cold-blooded and precise, while Ares is the berserker, capable of amazing deeds when his blood is up... He's aided by his sister Eris, aka Discord, and his sons Deimos and Phobos (panic and fear); the illustrations of them all in action are pretty darned terrifying!
[The TV Tropes page
on the Olympians has some entertaining tidbits.]