Here's an adaptation of something I pulled off last night in Entrenchment, thought it was worth sharing.
After weeks of skirmishes and being pushed steadily back by Advent forces, the Trader Emergency Coalition was able to seize the planet Wyvern, in the Cygnos Cluster, a key strategic focal point in the phase lane network and at the time, one of the few planets in the sector almost untouched by Advent forces. The planet Wyvern, an old naval base with many ancient relics left over from the great wars in the outer system (as a museum of history). With Coalition forces being pushed steadily back, Fleet Admiral Hunter, just returning from the Vasari Line with two Kol battleships, the Warspite and the Titunev, accompanied by the Dunov battlecruiser Firehawk, gave the order to acquire the planet Wyvern by any means necessary.
When diplomatic measures failed, and the Advent forces closing in, Hunter made the difficult decision to capture the local planetary defense headquarters and local militia's vessels. Once that had been accomplished, hundreds of thousands of the planet's inhabitants were called upon to begin reinforcing the planet's meager defenses. Shipyards, repair facilities, gauss cannons, and squadron hangars were hastily erected, but not before Advent scouts were able to detect the buildup and report back.
The first battle for Wyvern occurred when the Advent assault carrier Purity and several support ships arrived in the gravity well. Hunter's ships moved to intercept, eventually driving off the Advent starships with minimal damage to the planet's infrastructure, although several Javelis- and Cobalt-class frigates were destroyed, and the battlecruiser Firehawk took serious damage from enemy bomber wings.
Having gotten a bloody nose, Advent forces regrouped in the Vangelis asteroid field, across the system, before returning a week later with a battleship, two battlecruisers, a mothership and over three dozen Crusaders, Illuminators and other support ships. Hunter's 20 ships formed a battle-line under the umbrella of the planet's gauss turrets, between the planet and the advancing Advent fleet. Long range missiles and particle beams flashed back and forth, as the Advent commander sought to knock the ring of gauss cannons aside before engaging Hunter's brawlers.
Upon realizing what the Advent intended, Hunter's ships advanced, supported by planet-launched fighters and bombers. They were able to drive off the Advent fleet after several hours of close-range combat, while planetary bombardment ships emerged from phase space and opened fire on the planet, inflicting heavy damage on orbital and planet-bound facilities. They retreated once it became apparent that there was insufficient time to cleanse the population and bring them under the aegis of the Unity.
Reinforcements from Earth arrived, including several Kodiak heavy cruisers and Hoshiko robotics cruisers, accompanied by Vice-Admiral Kase aboard the carrier Tigerclaw. Quickly rebuilding the planetary infrastructure, they were able to assemble two shipyards and restore & reinforce the defensive garrison. When the Advent returned, vastly reinforced, they emerged from phase space right under the guns of a Coalition battle station. Backed up by minefields all around the gravity well, defensive turrets and heavy fighter-cover, the Advent forces closed on the battle station regardless of the swarms of mines and bomber attacks already beating at shield systems.
Once fully engaged, Hunter's reinforced fleet emerged from behind the planet and swung around the Advent's rear before moving to engage. Additional Advent ships jumped in behind him, but in insufficient strenght to affect the outcome; between the hammer of Hunter's ships and the anvil of the planetary defenses, the Advent forces were destroyed to the last ship.