Battle of Athaniss

With Mon Calamari secured by the forces of Palpatine, the man claiming to be noneother than the true Galactic Emperor set his eye on the backwater Imperial planet of Athaniss.

The Empire had predicted an attack on the planet, having gained valuable intelligence. The Tormentor was sent to reinforce the planet, but despite the best efforts of the Imperials, the planet fell to Palpatine and his "rebel" army.