Segmentum Tempestus is mercifully free from proximity to a festering mass incursion from the Warp, such as the Eye of Terror or the Maelstrom. As such, a Chaos incursion is usually a problem of raiders rather than the mass attack of a large Chaos Fleet of deranged Heretics. However, Tempestus is notorious for infestations of Genestealers, as well as assaults from Ork and Eldar raiders. There has, therefore, been a tendency for Tempestus battlefleets to concentrate on small flotilla anti-piracy tactics rather than Grand Fleet strategy.