Battle of Planet Sutune

The Battle of Planet Sutune was the first major battle in the Star System 17 Campaign of the 1st Interstellar War. It is the first battle where major elements of both the Federation and Imperial forces in Star System 17 clashed. In the battle the federation suffered heavy casualties, with the loss of 4 senior officers and a quarter of the 3rd Fleet being destroyed along with the majority of the Sutune Garrison Fleet. 
The battle ended with the complete withdrawal of all remaining federation forces from the planet system entirely to the sole remaining federation controlled planet in the star system, Arus. 
== Initial Space Battle ==
== Evacuation of Sutune ==
After nearly two weeks of fighting with defeat seemingly on the horizon, General Colson and Admiral Isaac agreed that the planet was lost and called for an immediate evacuation of all remaining federation forces and any civilians. This would be carried out by the 43rd Transport Fleet and 4th Auxiliary Flotilla while what remains of the 3rd Fleet would form a screen to protect the convoy ships and delay the advancing imperial fleet the best they can.
General Colson would ultimately die during the evacuation process when his headquarters was hit by an orbital strike. 
===Battle of Fortress Kion===
Battle of Fortress Kion also known as the Battle of LZ Olympia or Defense of Fortress Kion was a battle fought during the evacuation of Sutune. It took place on the outskirts of Sutunia, Sutune's capital city. 
The battle was of major importance to the evacuation and involved the 1st Battalion of the 1st Space Marines, Charlie 8 Platoon of the 5th Armored Company and Kilo-1 Company of the 22nd Infantry Division. It is unknown what imperial units participated in the battle. 
Both sides suffered heavy casualties during the battle, with the defending force being completely wiped out including the 1st Battalion's commanding officer, Colonel Jay. The total federation casualty count was 524 marines dead and 5 tanks lost including two Starfighters shot down attempting to provide air support. This compared to the imperial's casualty count recorded and found after the war small, they had lost at least 890 men with several hundred more wounded along with several tanks, armored personnel carriers and other vehicles including 5 bombers shot down during the initial bombardment pre-assault. 
Their sacrifice was not in vain however as at least 3,000 civillians and several wounded had managed to be evacuated. They had also delayed the northern imperial advance allowing more time to set up defences.