Battle of Nyrvona (TVC)

"Where have you been?" "Winning this war! I did it better than you, obviously!" "Great: Nyrvona gave you sarcasm!" "Not sarcasm, honesty!"

- Phoenix and Rex following the 501st's arrival on Ylesia, after winning the battle on Nyrvona.

The Battle of Nyrvona was the common name for the invasion and liberation of the acquatic world of Nyrvona, located in Hutt Space, which was (up until then) controlled by the Separatists. Part of a joint operation alongside the 44th Special Forces Division, led by Jedi High General Jeden Vesal (the 44th were attacking the neighbouring world of Ylesia), named Operation Colossus, the Battle coincided with dozens of other engagements across the galaxy by the GAR, signalling the beginning of what would later be known as the Outer Rim Sieges.

Background
Following almost a year of futile battles against the CIS, the Republic decided that it was time for a daring, galaxy-wide offensive against the primary Separatist holdouts in the Outer Rim. Beginning on the edges of the Mid Rim, the GAR would push through Hutt Space into the Outer Rim, crippling CIS resource zones, transport routes, and more importantly, droid forces.

The engagement that would begin what would later be known as the 'Outer Rim Sieges' was Operation Colossus, a joint operation by the 44th Special Forces Division and the 501st Battalion on the Hutt worlds of Ylesia and Nyrvona, which orbited the same sun. The 44th would attack the mainly-forest world of Ylesia, while the 501st would attack Nyrvona, an ocean world.

Anakin Skywalker, the Jedi Knight who normally commanded the 501st, was on a Jedi mission, and so control of the 501st for the duration of Operation Colossus was shared between Captain Rex, Commander Appo and Admiral Yularen, though Rex was Supreme Commander, and he got the final say. The plan for attack was that the infantry of the 501st would split between two companies, Sky and Walker. Walker Company, led by Rex, would attack the many dome-like, underwater cities on the planet, while Sky Company, commander by Appo, would engage the many battalions of defending Quarren warriors. The Quarrens, an underwater species native to Mon Calamari, often used flanking tactics, and so Appo was tasked with countering these offensives and holding the Quarrens back until Rex captured the cities.

Course of the battle
Incursion began using LAAT gunships. Both companies dropped into the water of Nyrvona from their gunships and engaged early defenses. Yularen's fleet at first struggled against the defending CIS fleet, which outnumbered them, though they were rescued by the fleet of the 44th, led by Admiral Olan Anhal, which used highly-specialized stealth gear and enhanced firepower. Following the successful space engagement, the fleet dropped into water mode on the ocean surface, acting as a base of operations for the two companies.

Rex and Walker Company arrived too late to Nyrvona's capital city, finding a strong Quarren garrison there. However, Appo was able to divert some forces to Rex's aid, with the 501st managing to capture the city. However, during the battle, a Quarren heavy cannon misfired and hit one of the domes, piercing it's shield and flooding the inside, drowning thousands of innocent civilians inside, who were all of different species.

Appo and Sky Company soon found the main Quarren base on Nyrvona, hidden in caves beneath the sea-bed. Now equipped with prototype 'water-tanks', Sky attacked the caverns, annihilating the mostly-infantry Quarren garrisons. Walker went on to capture three more smaller cities, and despite the Separatists being commanded (though not led) by Count Dooku at one point, the 501st still managed to take over the small planet. The Quarren Isolation League, who had been the ones defending Nyrvona, either surrendered or fled, and the planet was liberated, to the joy of the planet's civilians.

Aftermath
The Battle of Nyrvona was relatively short, lasting a month compared to the 3-month Battle of Ylesia. However, the 501st were forced to switch all of their equipment due to a different environment, and stormy winter weather over Ylesia's capital, Ulsor, halted any hope of reinforcements reaching the 44th until the last day of the Battle, which the 501st took part in and helped to win.

The 501st casualties were minimal, and were some of the best casualty records the Battalion ever gained during the War, with less-than-expected soldiers dying seeing as how it was a planetary invasion, even though Nyrvona was a small planet, with a 10-hour day and an easy-to-traverse ocean environment.