A long low mound of rubble incompletely surrounds part of the central zone at the Classic Period site of Chunchucmil, Yucatan, Mexico. This wall was hastily built from stone robbed from nearby buildings and roadbeds and it clearly served as a defensive barricade. All indications are that the barricade represents a one-time event whereupon the site was attacked, overrun, and abandoned. Re-analysis of other known fortified sites across Yucatan"s northern plains show some fundamental similarities. I suggest that all sites with barricades still standing suffered wars of annihilation rather than wars of conquest and subjugation by the victors. I suggest that the Chunchucmil distribution node was annihilated because its proximity to consumption centers in nuclear Mesoamerica reduced the competitiveness of other Yucatecan coastal trade sites that were located further away along the Gulf Coast maritime trade route.