Ive been wondering in terms of numbers in the field how many troops the Tau would actually field in a battle??
Say for example the Tau attack an imperial world to take over during the 3rd sphere expansion perhaps, they would get a foothold on the world by means of espionage and diplomacy but then when they actually invaded would they be able to field enough numbers to take over a planet held by the Imperium?
Maybe not a major world with billions in terms of population but a smaller fringe world with a a couple hundred million citizens and a PDF of a 300-500 thousand or so. They would need to field at least 100 thousand troops plus all the auxiliaries to actually take the planet by force possibly more than that.
The question is would they have the means to field armies of hundreds of thousands and a fleet large enough to take over even medium sized worlds by means of force alone?? of course large parts of Tau armies are tied up in drones to take casualties and do the dirty work but still it would take a massive amount to take over an entire planet.