Hammerverse (or the Slammerverse, Slammers universe, Hammer universe) is a setting for a series of military science fiction short stories and novels by author David Drake.
The series follows the career of a future mercenary tank regiment called Hammer's Slammers, after their leader, Colonel Alois Hammer.
As with his other work, Drake borrows plots from historical or mythological sources for many of the Hammer's Slammers stories. For example, he retells the story of Jason and the Argonauts in The Voyage, and part of the Odyssey in Cross the Stars. Other stories borrow from pulp era fiction (The Sharp End is based on Dashiell Hammett's Red Harvest.)
Short essays in Hammer's Slammers provide details of the political, social, economic, and technological conditions in the Hammerverse.
The contents of the first five books of the main series were repackaged and republished, with some additional stories. Drake has said that this is his preferred order and edition.
The Complete Hammer's Slammers (2006): is a three volume set from Night Shade Books that contains all Hammer's Slammers fiction, including three new stories written for this set. Volume 1 was released in January 2006, and features an introduction by Gene Wolfe. Volume 2 (introduction by David G Hartwell) was released January 2007, with Volume 3 (introduction by Barry Malzberg) following in November 2007.
These are works set in the Slammers universe, and involving members of the Slammers, or former members, but not directly featuring the Slammers as an organization.
The Forlorn Hope (1984) is about another, smaller, low-rent body of mercenaries, Fasolini's Company, based on Xenophon's Anabasis or The March Upcountry. While the setting and themes of the novel are similar to those of the Hammerverse, Drake has confirmed that this novel is not part of the series.