This is The Battle of Vesh’yo diorama.
The legions of the Cult Mechanicus launch an assault on the resource-rich Tau colony world of Vesh’yo, intent on plundering it to feed the insatiable appetites of their Forge Worlds. The mighty Titans of Legio Atarus walk alongside the Knights of House Col Khak, bound to the Lords of Mars by oaths of fealty even older than the Imperium. But will this be enough to defeat the cutting-edge technology of the upstart xenos? Can even a Titan prevail against Tau Supremacy Armour?
There was a huge display of Tau forces defending themselves against an attacking force of Imperial Knights and Titans. At the heart of the battle was the huge Tau Manta.