Operation Serval was the coordinated invasion of the Centrality by Darth Krayt's Galactic Empire in 138 ABY, prompted by the Centrans' covert support of the Galactic Alliance Remnant. After a century of hiding, the One Sith dark side group came out of hiding to launch an attack in conjunction with the Fel Empire on the Galactic Federation of Free Alliances controlling much of the galaxy. The Sith then split from the Fel Empire in 130 ABY and forced both GFFA and Fel remnants to the Outer Rim Territories and Wild Space by 137 ABY. At this point, the Sith leadership attempted to isolate the resistance groups from their supply sources by convening a diplomatic meeting on the planet Mon Calamari to enforce a policy of no commerce with the Galactic Alliance Remnant and the Fel Empire.
The string of conferences was suspended after the participants had agreed to cease trade with factions deemed to be opposing Darth Krayt's Galactic Empire and permitted the Imperial government to move troops into their territory to monitor fulfillment of the treaty. Sith intelligence, however, suspected one of the parties, the Centrality, of knowingly violating the terms of the treaty by harboring smugglers delivering cargo to Galactic Alliance locations, and the Imperial leadership decided on instigating a coup d'état in the state supported by a simultaneous Imperial invasion. Under the guise of a planned attack on Alliance remnants spinward of the Centrality, the Empire moved a sizeable fleet down the Perlemian Trade Route, led by Darths Havok and Maladi.
While a smaller Sith unit launched an attack on Alliance bases near Mon Calamari, Darth Maladi entered the Centran governmental district on the capital world Erilnar and massacred much of the Centran political and military leadership. At the same time, five task forces of the Imperial Navy and over ten million soldiers of the Army struck at key Centran locations, such as Erilnar and Tund, at the same time. The Centran Armed Forces were unprepared to repel an attack of this scale and soon retreated into the rimward portion of the Centrality, with some parts of the navy covering the retreat by engaging the Sith at Tund to slow their advance. The C.A.F. and much of the rimward region's civilan population eventually evacuated into the nebulae above the galactic disk in the region, while the Empire formally annexed the Centrality as a sector and appointed a Moff to preside over its affairs.
Operation Serval resulted in the effective termination of trade towards Alliance territory via the Centrality. The C.A.F. and Centran officials who had escaped declared the Centrality in their new territory and launched occasional raids on former Centran worlds. Eventually, as the Galactic Federation Triumvirate toppled Darth Krayt's regime, the Centran forces regained the Centrality from the disorganized Sith units in retreat.
In 130 ABY, the Galactic Federation of Free Alliances, the political entity ruling much of the known galaxy was attacked and defeated by the alliance of the Fel Empire—the successor of the Galactic Empire—and the One Sith dark side group. By 137 ABY, the GFFA had been forced to strongholds in and beyond the Outer Rim, and the One Sith deposed the Fel leadership, which eventually fled to and allied itself with the Galactic Alliance remnants. At this time, the Centrality became a hub of merchant and smuggler traffic towards Alliance territory in the Rim and above the galactic plane.