The aftermath of the Battle of Andoria was a time of recovery and repair for Starfleet. Much of the fleet had been tattered in the defense of the planet, with those that were damaged but salvageable being directed to the Andor Fleet Yards and others dispersing to the Vulcan and Terran systems for repair. Andoria had lost nearly forty thousand civilians in the bombardment, a number thankfully reduced by existing shelters devised during the Vulcan conflicts and much of the infrastructure being sub-surface where the terrain provided some protection.
Needless to say the Imperial Guard was now eager to take the fight to the Klingons. But as the year ticked over into 2243 no great counteroffensive was yet ready, and the Guard were instead left waiting. But the Klingons were in no position to capitalise on the slow recovery of Starfleet, with the loss of their Supreme Commander and the majority of their deployed forces setting off a powderkeg of internal politics they were struggling to prevent turning into civil war. Karhammur's quite literal fall from grace into the icy glaciers of the Andorian homeworld was having lasting repercussions.
As Starfleet took their time picking through the wreckage in orbit of Andoria and analysing Klingon advances in metallurgy, there was a real risk that the House of Duras would lose control of the empire entirely. This was prevented only by the actions of Karhammur's third son and now heir, Koval, who was still on the homeworld and able to maintain authority by securing Qo'nos against the usual probing threats of Klingon politics. He was proclaimed with Chancellor with near unseemly haste by House of Duras loyalists before the week was out.
The new Chancellor's rule remained weak for some months as other Houses moved their forces away from their Federation conquests and staging areas towards the Klingon interior in case of open conflict for the leadership of the Empire. But as spring ended in San Francisco and summer arrived, Starfleet was finally ready to begin its long-awaited offensive into occupied territory. With its surviving ships repaired and Member Fleets now able to risk lighter garrisons in orbit of their own worlds, the Federation moved out en masse.
Within a matter of months skirmishes with Klingon raiding forces saw the Empire repelled from Kepler-018, Labac, and the vicinity of Rigel. The supervisory Klingon population of conquered colonies and minor worlds were often in the low hundreds and lacked any orbital fortifications that could repel Starfleet. The front line was pushed back nearly thirty light years, with the House of Antaak losing control over Arcadia in early October.
But the Empire was not idle. With Koval's grasp on the Chancellorship becoming more secure and Klingon gains being rapidly eroded, there was every incentive for the Klingons to strike back. What seemed to be a new tranche of D7s appearing to pounce on isolated Starfleet relief convoys and smaller patrols prompted a pause in the offensives and a consolidation of Federation fleet assets that slowed the reconquest of occupied territory. It soon became apparent however that the quality of their construction had been sacrificed on the altar of speed, with less robust power systems, reduced warp factors, and hulls built with recycled alloy from scrapped D6s.
Starfleet Command elected to pause regardless and despite political pressure, taking a breather to establish forward supply stations and begin some of the urgent aid operations that were so desperately needed by the populations of liberated settlements. While the Klingons were showing a weak front there was no appetite for the possibility of another reversal as the Federation pushed further from core space, however slim. Moreover, the prospect of more than doubling the number of Excalibur-class hulls available in a matter of months as Utopia Planitia finished their latest construction order made waiting a much more attractive proposition.
So the third year of the war ended with the largest change in territory but the smallest degree of conflict. But there was little doubt in the mind of either side that there would be more bloodshed before the end.