The Sanghelios Massacre of 2570 was an extensive terror campaign orchestrated by elements of the insurrectionist Humanity Liberation Front against population centers on Sanghelios. Making use of stolen Sangheili military transports and communication codes, a small force of HLF-trained commandos launched devastating attacks against keeps and citiies while keeping ahead of the extensive government task force established to eliminate them. Although the government warriors eventually cornered and wiped out the rebels, the humans' use of military-grade weaponry against heavily populated urban centers led to an astoundingly high death toll of over a million Sangheili and a wave of anti-human sentiment amongst the Sangheili population.