The Wolf Pack is the nickname given to a collection of Spartan-III supersoldiers who gathered on the frontiers of Aszod and fought to the death against a massive Covenant onslaught on August 29, 2552.
In August 2552, the area in reach known as Aszod was assaulted by Covenant forces. Scattered fireteams fell under the massive Covenant onslaught, and few members survived from any side. Thirteen of these heroes gathered together in a final effort to survive and leave the planet, or out of final defiance to the Covenant. Either way, not much is known about the Spartans.
There were thirteen Spartan-IIIs in the Wolf Pack. SPARTAN-B312 discovered their remains during his final stand only a day later.