Source Material #144 - "300" (Dark Horse) (1998)

the guys talk about a Frank Miller jam called "300"

From comicvine.com

300 is Frank Miller's famous retelling story of the battle of Thermopylae. King Leonidas leads a Spartan army of only 300 men into battle against the army of Xerxes I of Persia, a force outnumbering them by thousands to one. The Spartans maintain a stand-still, holding off Xerxes' forces for two full days at a narrow pass known as the Hot Gates before the deformed and treacherous Ephialtes betrays the Spartans to Xerxes. This betrayal leads to the outflanking of the remaining Spartan soldiers, and their inevitable deaths on the third day. The tale ends a year later at the battle of Plataea where a now-united Greek army prepares for the final battle against Xerxes.