Ultramarines - Tyrannic Wars and the Battle of Macragge: Over the 10 Terran millennia that passed after the loss of Roboute Guilliman, Ultramar held against all manner of invaders -- some so strange as to defy the comprehension of the common man. The Ultramarines have tested their might against Ork WAAAGH!s and Renegade uprisings, T'au incursions and Necron raids, but the measure of their heroism is shown truest in battles where they have defended all life in the galaxy itself in the face of threats from beyond known space.So did the Sons of Ultramar prove in the 35th Millennium in battle against the Star-Striders of Crioth, and in retaliation for the Heavenfall Massacres. But of all these terrible wars and heroic struggles, there is one conflict that stands above all others -- the onslaught of the Tyranid Hive Fleet Behemoth, and the Battle of Macragge in 745.M41.Upon learning of the threat posed to Ultramar by Hive Fleet Behemoth from Inquisitor Fidus Kryptman, Chapter Master Marneus Calgar at once drew up his plans. Deeming Macragge to be the star system most immediately threatened, Calgar ordered its already formidable defences to be further improved. A dozen warships already hung in orbit, and each day more arrived from the Warp.Massive strike cruisers cast shadows over civilian vessels and Navis Imperialis destroyers, and were themselves dwarfed by the brooding presence of the Ultramarines' battle barges. Between this mighty fleet of warships and the planet's no less formidable orbital defence stations, Macragge was anything but defenceless. Scant solar weeks later, the outrider vessels of the Tyranid hive fleet attacked Macragge.The alien bioships swept aside attacks by Ultramarines strike cruisers and swarmed over the planet below. Soon many thousands of Mycetic Spore-birthed bioforms scurried and rampaged across Macragge. Deeming that the Tyranid threat was too massive to be opposed piecemeal, Calgar combined his ground forces into three mighty armies.The primary and secondary taskforces, composed largely of Ultramarines 1st Company Veterans and Ultramarian Planetary Defence Forces of the Ultramar Auxilia, bolstered Macragge's polar fortresses against the Tyranid onslaught. Meanwhile, Calgar's own taskforce, the largest of the three, performed a series of rearguard actions, attempting to slow the Tyranid advance and eliminate Hive Mind synapse-control organisms. Calgar achieved great success in the early days of the campaign, buying time with blood for his battle-brothers to the north and south. However, the Tyranids kept coming.In a final climactic battle on Cold Steel Ridge, the Ultramarines rearguard was brutalised by the Tyranid horde and Calgar himself was gravely wounded. Knowing that to remain planetside was to doom his followers to wasteful death, Calgar withdrew to the orbiting battle barge Octavius. Refusing all but the most vital medicae attention, the Master of Macragge took command of the fleet, and sought a way to save his world from certain destruction.Solar hours later, the main Tyranid hive fleet arrived at Macragge. With no sign of reinforcements, Calgar led his fleet in a series of daring attacks, striking at isolated vessels as they spread out to invade Macragge in force. Caught between the blistering firepower of Macragge's polar fortresses and the vengeful hammer blows of Calgar's fleet, Tyranid vessels were destroyed by the score, but many more yet remained.As battle raged, the Tyranids unleashed thousands of Mycetic Spores above the vital polar fortresses -- if the fortresses were taken, Macragge's guns would be silenced, and the world left defenceless. So it was that the Tyranids landed in even greater numbers than before, and the fortresses soon found themselves sorely beset. Their gruesome cargo delivered, the battered Hive Ships retreated from orbit.Trusting to his Ultramarines to keep the fortresses secure, Calgar relentlessly pursued the Tyranid fleet, determined that it would not bring ruin to other worlds. Never before or since has the valour of the Ultramarines been tested as it was in the defence of the polar fortresses. The Veteran Space Marines of the 1st Company led the lightly-armed Ultramar Auxilia in a tenacious defence of the fortresses, holding every wall and trench until the last possible moment before it was overrun by the Tyranid swarm.Slowly the Imperial troops withdrew ever deeper into the fortress, while making the Tyranids pay for every single metre of ground they advanced. The Titans of the Legio Praetor stalked the ice fields and drove smoking furrows through the onrushing Tyranid hordes with shells and plasma. The ferocity of the swarms was unbelievable. At the northern polar fortress they overran the walls by using the steaming piles of their own dead for cover. Imperial Battle Titans were dragged down and ripped apart by sheer weight of numbers. The defenders' gun barrels glowed red hot and jammed in spite of the arctic cold, ammunition began to run low even though the fortress had contained stockpiles intended to last for solar months of siege.Yet still the defenders fought on. Lumbering, scythe-armed Carnifexes tore into the defenders' bastions like living battering rams, smashing their way through metal and rockcrete walls with equal fury. The Ultramarines had to rely on heavy, short-range firepower to bring down the foe, but for each Tyranid that fell, another three sprang forward to continue the fight. Lesser troops were paralysed with terror as the Tyranids broke through the perimeter again and again, but the Ultramarines never despaired and never gave thought to defeat.Calgar pursued the Tyranid fleet toward the ringed world of Circe at the edge of the Macragge System. The timely arrival of the Armada Imperialis' entire Battlefleet Tempestus from Bakka finally sealed the Tyranids' fate by catching them in a vice between the two fleets. Even now, the Imperial fleet was overmatched, for the Tyranids were too many.The battle would have been lost save for the heroic sacrifice of the great battleship Dominus Astra. Charging into the heart of the hive fleet, the huge Emperor-class Battleship detonated its Warp-Drive, creating a Warp vortex that dragged both it and the entire Tyranid hive fleet to oblivion.With the bulk of the hive fleet destroyed, Calgar's surviving starships came about and returned to Macragge to try to save the polar garrisons. The survivors of the Ultramarines 1st Company were still believed to be fighting amongst the defence laser silos of the northern citadel, but all contact with them had been lost after the Tyranids overran the surface outposts. Of the southern polar garrison, nothing was known.Calgar, feeling that the situation was becoming critical, sent the 3rd and 7th Companies of the Ultramarines ahead in their fast strike cruisers while his remaining damaged voidships limped back to Macragge. The Space Marines of the 3rd and 7th Companies deployed onto the poles by Drop Pod, their supporting units following up in Thunderhawk gunships.Scenes of unbelievable carnage awaited them below. Piles of mangled Tyranid corpses and shattered wargear lay strewn across the ice. Vast, steaming craters pocked the snows where Titan Plasma Reactors had gone critical. The stench of death lay everywhere. The 7th Company landed unopposed at the southern polar fortress and quickly linked up with the survivors of the garrison above ground.Together they pushed on to clear the subterranean passages that the Tyranids had overrun. Devastator Squads kept the alien swarm at bay until Thunderhawk gunships arrived to blast the Tyranids back into the darkness. Captain Mikael Fabian of the 3rd Company prudently awaited the arrival of the company's three Dreadnoughts before proceeding into the fortress itself to search for survivors.The dark, dank corridors beneath the northern polar fortress were already altered by the xenos presence. Mucous dripped from the walls and ceilings and a pervasive musky stench filled the air. Alien screams and roars echoed and reverberated along the tunnels. The Space Marines pushed onward into corridors littered with Tyranid and Ultramarines dead, the darkness reluctantly receding before the lights of their power armour.Chameleoid Lictors lay in ambush amongst the defenders' corpses, slashing into the advancing squads in an orgy of destruction. Eventually the forward squads used flamers to burn their way along the passages and flush out their enemy. Even as fire consumed them, the Tyranid creatures still leapt forward with claws outstretched to rend and slay.Through darkness and terrors unimaginable, the 3rd Company finally reached the lower Penitorium where the defenders had made their last stand. Tyranid bodies were piled deep around the doors, and within the room a circle of Terminators lay where they had fought back to back. Each had given his life for his brothers. The Ultramarines' 1st Company had been wiped out to the last man. The Battle of Macragge remains a great source of both sorrow and pride for the Ultramarines. The names of its fallen are commemorated each year at the Feast of Days, their sacrifice remembered throughout Ultramar with honour and gratitude. But the cost had been great. The Ultramarines 1st Company was gone and the 3rd and 7th sorely diminished. It would be many long years before the Chapter could properly replace its losses, but replace them it would. The Ultramarines would endure.Since the Battle of Macragge, the Ultramarines have become instrumental in the Imperium's wars against other Tyranid hive fleets. In response to the threat, and counter to the dictates of the Codex Astartes for the first time, the survivors of the Battle of Macragge were formed into elite, specially-trained anti-Tyranid squads. These so-called Tyrannic War Veterans make up the first and most powerful of the Chapter's reformed elite 1st Company, and are second to no other warriors of the Imperium because of their experience, training and upgraded power armour.