My first question was going to be as what army. As of course your own force composition is going to shape a lot of your tactics that you can effectively apply. Your last comment assumes you're coming from a guard standpoint primarily?
Devoid of specific details, in my opinion the best way about taking Tau on is maximum aggression and application of pressure. Tau as an army are perhaps the best example of a force that punishes half hearted or piecemeal attacks. With the volume of fire they have at their disposal, the best thing to do is to overwhelm them so they can't just wipe you at their leisure. You need to dictate the pace of the game and leave them without the luxury of choosing what targets they want to delete off the table. Be it as a combat army or a shooting army I maintain that a tactical aggressive stance is the best way forwards.
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