How does the author use foreshadowing in The Fall of Hyperion?

In Chapter 21, Silenus is surprised at the turn his poem is taking, with the Titans, led by Saturn and Hyperion, forming a pact of peace with the Olympians, led by Zeus, in order to defend themselves against a third usurping force. This foreshadows the alliance created between the Ousters and the Hegemony in order to meet the threat of the TechnoCore.