This volume collects the second trilogy in the saga of Corum Jhaelen Irsei and consists of "The Bull and the Spear", "The Oak and the Ram", and "The Sword and the Stallion". Corum, for those of you who are not familiar with Moorcock, is an incarnation of the Eternal Champion. In this trilogy, Corum is called into the distant future to assist in the battle against the Fhoi Myore. While there, he learns some important lessons about love and belonging.
I have to confess that Corum is probably my least favorite of the incarnations of the Eternal Champion-- I like both Elric and Hawkmoon better. All the same, you have the general elements of Moorcock greatness-- brooding reluctant hero, the companion & his cat, and a strong tie in to historical myth and legend.
Start with the Swords Trilogy, and not here, if you have read no Corum before. The backstory is helpful to understand character motivation, if nothing else.