Clan Diamond Shark occupies a unique position among the Clans. Within a rigidly hierarchical blueprint for society, they have come closest to democracy; among people convinced that military strength depends on tight controls and reverence for the chain of command, the Diamond Sharks have achieved remarkable battlefield prowess through the kind of flexibility other Clans disdain. Clan Diamond Shark is also the only Clan ever to have changed its name, a startling shift for a society that values order and stability above virtually all things. In changing its name, Clan Diamond Shark adapted to a unique set of circumstances. Its ability to do so most clearly demonstrates this Clan's unorthodox nature.

Clan Diamond Shark began its existence as Clan Sea Fox, named by Nicholas Kerensky for a seallink reptilian predator found in Strana Mechty's freshwater oceans. Nicholas admired this animal for the honor it apparently paid to its prey, seeming to bow to its opponent before attacking. Nicholas saw the ability to honor one's enemy as one of the essential traits that set the true warrior apart from the barbarian killing machine. Clan Sea Fox remained admirably faithful to that trait, as well as to the idealism and adaptability bequeathed to it by its two most influential Khans. Though born more than a century apart, Khan Karen Nagasawa and Khan Damon Clarke did more to shape Clan Sea Fox than any other leaders in this Clan's history.

As with the invasion itself, Khan Ian Hawker failed to earn his Clan a pre-eminent place during the bidding for this historic battle. Over-eager to win the right of first landing and over-confident of his warriors' strength, Khan Hawker initially bid a mere six Clusters, and dared not go too far below his opening gambit. The Khans of the other Clans all surpassed Clan Diamond Shark in the number of concessions they could make, and so Clan Diamond Shark ended up landing second to last. Adding insult to injury, Clan Smoke Jaguar won the right to land first.

The Diamond Sharks' target cities, Kozice Prime and Urcunat, lie a mere 20 kilometers from each other on the far side of the Kozice Valley. All five Clusters of the Shark assault force landed in the valley; Alpha Galaxy's Nineteenth Heavy Cluster and Thirty-ninth Striker Cluster headed toward Kozice Prime, while Gamma Galaxy's 222nd Assault Cluster and 369th Striker Cluster headed toward Urcunat.

Alpha Galaxy's Nineteenth Heavy Cluster met the 182nd and Eighty-fifth Divisions of the Third ComGuard Army in the foothills overlooking Kozice Prime, while the elite Thirty-ninth Striker Cluster clashed with a division of the Eighth Army as the Clan 'Mechs entered the narrow end of the Kozice Valley. The Nineteenth Heavy fared well against the Eighty-fifth, but could only make a little headway toward their objective before the 182nd Division outflanked them. The 182nd held Alpha Galaxy' forces down in a brutal slugging match, while the remaining 'Mechs of the Eighty-fifth joined the Thirty-first and Fifty-sixth in an attempt to disrupt the Sharks' supply lines.

Gamma Galaxy's Clusters quickly turned their attention to this new threat, and the 222nd Assault Cluster won the honor of destroying the raiders. The conflict between the 222nd and the ComGuards' Eighty-fifth Division was particularly brutal, with neither side able to gain the upper hand for some time. Finally, Star Colonel Seth Davis grew so frustrated that he called upon the remaining Clusters of Gamma Galaxy for help. The added 'Mechs enabled him to crush the Eighty-fifth, only to lose all but a single MechWarrior to the avenging Thirty-first and Fifty-sixth Divisions.

While Gamma Galaxy battled the doomed Eighty-fifth and the divisions of the Eighth Army, Precentor Burkenbine's Fifth Army executed a combat drop behind the Sharks' front lines, neatly cutting Alpha and Gamma Galaxies off from their landing zone and supplies. Meanwhile, the ComGuards troops already in the valley received reinforcements from the Eighty-second, 301st, and 182nd Divisions. The shocked Diamond Shark Khans found their Galaxies completely surrounded and dangerously low on ammunition.

Khan Hawker regrouped the surviving Alpha and Gamma Clusters for an all-out frontal assault in a desperate attempt to break through the deadly ring of ComGuards 'Mechs. Meanwhile, Khan Sennet called upon the reserve 'Mechs of Omega Galaxy to rescue the front-line units from the trap. While Omega Galaxy fought its way past the 323rd and 299th Divisions of the Fifth Army, the rest of the ComGuards cut down the charging Alpha and Gamma Galaxy OmniMechs like so much wheat. The frontal assault, so prized by Khan Hawker because he considered it more Clan-like than more devious tactics, proved a fatal mistake in the brutal contest with the well-equipped and far trickier ComGuards.

Despite the heavy damage done by ComStar's forces, Omega's reserve 'Mechs finally managed to punch a hole in the ComGuards' iron net. The remnants of Alpha and Gamma Galaxies limped back to the landing zone, the ComGuards harassing their flanks and rear all the way. Just as the Clan drew within sight of its DropShips, the ComGuards massed for a final killing assault. The Diamond Sharks waited for the deadly blow, but it never fell. Instead, the freebirth MechWarriors of Omega Galaxy silently spread out and met the enemy head-on. The ComGuards destroyed Omega Galaxy, but the freebirths' sacrifice cleared the way for the remnants of Alpha and Gamma Galaxies to make good their escape.

In recognition of the incredible bravery shown by a class of warriors he had always de-valued, a chastened Khan Hawker formally rescinded his ban on freebirth warriors serving in front-line OmniMechs. Despite the courage of its troops, Clan Diamond Shark lost almost all of the troops it had committed on Tukayyid.

In the years since 3056, Clan Diamond Shark has slowly recovered some of the considerable honor it lost by losing so clearly on Tukayyid. Khan Ian Hawker himself was one of the fourteen Khans present at the Grand Council and with his scorn for the pragmatic, voted against Clan Jade Falcon Khan Elias Crichell's nomination for ilKhan. It was the negative votes of the Diamond Shark Khans that allowed Khan Vlad Ward of Clan Jade Wolf, a Clan formerly named Wolf, declare a trial of refusal against the election of Crichell to ilKhan and kill Elias in that trial.

The Clan Diamond Shark's ability to adapt and adjust to their situation and surroundings is the thing that differentiates them from the other Clans and may be the one thing that allows them to recover from their disastrous loss to ComStar on Tukayyid, regain their honor, and return to their position of power as one of the invading Clans.