Of course I got more books at The Whale of a Book sale than just this one, but I figure I start with the best, or at least the book that sounds the most interesting.

The Big Time is part of a series of books by Leiber that deal with time traveling armies that are fighting against one another to control all time and the existence of humanity.

The two armies are known as the Spiders and the Snakes. Their members are recruited from all periods of time. And this army does not need to be all human, however, as many beings from the distance and future make up parts of these armies.