The title of this story refers to the real life Battle of Marathon which took place in 490 BC, during the first Persian invasion of Greece. The invasion was first attempt by Persia, under King Darius I, to subjugate Greece. The Greek army decisively defeated the more numerous Persians however and Rucka alludes to this as the Amazons too face seemingly overwhelming numbers of OMACs intent on wiping out the entire Amazon race.