The war is a "logistical nightmare" for the Imperium, pitting massed infantry and armored columns against the Tau's superior hit-and-run mobile warfare.
If you want to play Tau in 10th edition, buy the Tau Empire Codex and the Imperial Armour Compendium . But if you want to understand the Tau—their cruelty, their efficiency, and the horror they inflicted on the Imperial Guard at Taros—then the hunt for the Second Edition PDF is a journey worth taking. Just bring a virus scanner. The war is a "logistical nightmare" for the