Editing History of the Green Men (section)

===The Scourge of Sud Merica===
{{Main|Siege of Terra (Hektor Heresy)#Sand Keepers vs. Green Men}}
Galen's moment of triumph came when the Life Bringers' fleet was nearing Holy Terra. After months of constant experimentation, after thousands of captive Space Marines killed, tortured to death or turned into slobbering lusi naturae in his laboratory, after countless humiliations at the hands of Wilmut Sachs and his clique of incompetent quacks, his life's work was done. Without any assistance from the Ruinous Powers, through sheer perseverance, scientific rigorism and willingness to use any means to his ends, he finally managed to successfully merge human and plant into one that was more than the mere sum of the two. Of course, the first Green Men looked rough and monstrous, with branches and foliage protruding from their bodies, mouths that opened like flowers and vegetation sprouting from all their orifices. Their strange habits like sitting in a single pose for hours and spreading mud over their bodies also didn't help. However, their eerie appearance did little to discourage their creator: Galen viewed these grotesque monsters as mere prototypes, whose appearance could be perfected after the False Emperor was pushed down from his ill-gotten throne.

Elated by his triumph, Nikephoros rushed to meet Vrach, accompanied by the first batch of Green Men. A group of Plague Marines tried to bar their access to the Primarch's private quarters, so Galen simply ordered them killed. Over the bodies of his dead battle brothers, he stepped right into Vrach's great hall to present his greatest discovery to him. With pride ringing is his voice, he introduced the Green Men to the slightly confused Primarch and described their exceptional qualities, including complete immunity to all disease. Even though Vrach was clearly taken aback by Galen's brash conduct, he was most impressed by the fruit of his labour. Seizing the opportunity, Nikephoros demanded that his superior Green Men replace the foul Plague Marines, that the Legion is purged of Nurgle worshippers and that Wilmut Sachs is immediately drawn and quartered for treason. These demands were clearly a miscalculation on his part, as the Primarch was not ready to approve such a radical purge, especially not on the eve of the Siege of Terra. Instead, he told Galen to retreat to his quarters and await his ruling on the matter.

Vrach's ruling left both parties discontent. Recognising the superiority of the Green Men, he nevertheless admitted that his Legion's alliance with Nurgle had already paid in spades and had not nearly exhausted its usefulness. Therefore, he announced a contest between the two factions: the one that would prove more effective during the Siege of Terra would take over the Legion, the other one would be purged. Though this was clearly not the ruling Galen and his adherents had been hoping for, they accepted it nonetheless. As a symbolical gesture of confidence, Nikephoros and all the Life Bringers loyal to him injected themselves with the Green Man compound, thus severing what little ties they had left with humanity and transforming into vile plantmen. Although it is now impossible to say for certain what effects this transformation had on Galen's mind, it must have affected him in a most dramatic way. Most Inquisitors studying the Green Men agree that it was his injecting himself with the imperfect, experimental Green Man genetic compound that finally turned Galen from a merely misguided scientist too obsessed with his dream project into the heartless, inhuman monster that the Imperium has come to fear and revile in equal measure.

During the Siege of Terra, the Life Bringers did not fight at the forefront of the assault; instead, at the behest of Hektor, they spread all across the globe in order to tie down the scattered groups of Terra's defenders with battle and prevent them from reinforcing the defenders of the Imperial Palace. The Green Men in particular fought the [[Sand Keepers]] in the accursed wastes of Sud Merica. Galen's plan was to turn this lifeless cesspit of pollution into one of his infamous Seas of Corruption, thus introducing life back to the withered husk of Mankind's cradle. This way he would not only fulfil the Life Bringers' mission of restoring dead worlds to their bygone verdant grandeur, but also give his troops an enormous strategic advantage, for the Sand Keepers could hardly fight effectively in a toxic jungle, unlike the Green Men. Fortunately, his diabolical plan fell through when the Sand Keepers conjured great sand storms that chocked the sprouts of toxic fungi before they could grow. Infuriated, Galen ordered a full-on assault on the enemy ranks. In spite of the Life Bringers' numerical advantage, it was eventually repulsed by the loyalist forces, who then initiated a highly successful counter-attack. It is not clear whether it was due to the Green Men still learning to control their new vegetative bodies or sheer heroism of the Sand Keepers, but the result stays the same: the Green Men were soundly beaten by the sons of Cyaxares.

And so the Green Men's baptism by fire ended in their total defeat. The only thing that sweetened the pill for Galen was that the Plague Marines of Sachs were similarly crushed by [[Scions of Europa]] in the Battle for Untark Teed. But the worst news were yet to come: mighty Hektor Cincinnatus, the leader of the rebellion, was slain by the Emperor in his own throne room. Worse still, rumours reached the remaining Traitor leaders of several Loyalist Legions rushing for Terra, eager to bring judgement upon their wayward brothers. Seeing no point in risking their lives for a failed cause, the Traitor Legions haphazardly evacuated the remainder of their forces from Terra and journeyed into the impenetrable darkness of Space, each one to its own damnation. The Life bringers were no exception. And although Galen resented having to fight side by side with Sachs again, he still hoped to win the Primarch for his cause, and so he decided not rebel for the time being.