Donatos War - Rebellion: The rule of the Imperium is a harsh one, especially on those countless worlds subject to the Imperial Tithe, whose taxing demands are to be met in time and in full. Such is the strain put on a world's economy that its population have to toil almost incessantly to meet the Adeptus Administratum's demands. Worker strikes and other forms of civil unrest are far too common and often discipline can only be maintained by the heavy hand of the Adeptus Arbites or local law-enforcers. So when the first signs of trouble emerged within the industrial sprawl of Donatos Primus' northern hive cities, none of the world's rulers were particularly troubled.Planetary Governor Gnossul ordered the deployment of several squads of Donatosian Planetary Defence Forces -- a force which in the past had often sufficed to quell any civil unrest. Yet this time, rather than open fire on the mob, the men and women of the Planetary Defence Militia joined the ranks of the rioters, for even within the Donatosian military the discontent ran deep. Unsure of his troops' loyalties, the head of the Planetary Defence Militia, Commander Korgh, deployed his troops sparingly. This proved to be too little to stem the spread of open rebellion both amongst the civilian population and Donatos' PDF regiments. As more and more regiments declared for the rebels, the situation became tense.Despite the scale of this revolt, Governor Gnossul remained confident that he could keep what was beginning to be called the Donatos Uprising a purely internal matter. The Governor's confidence was largely born of experience. As a Class II Industrial World, Donatos Primus had seen its fair share of insurrections, revolts and even civil wars, which had led Gnossul's forbears to seek the help of the Adeptus Mechanicus in erecting a series of heavily armed and strongly fortified keeps known as the Adamant Citadels at strategic locations on the world. Each fortress was near-impregnable and was specifically designed to control and defend its allotted sector from both interior and exterior threats. Even this latest rebellion lacked the manpower or the resources to take on one of the Citadels. Thinking he had more than enough time to react, the Governor gathered yet more PDF regiments and Adeptus Arbites around him, ready to sally forth and crush the rebellion. He could not have foreseen what was to come.Unknown to the governor and his staff, the rebellion had been kindled by one of the insidious Chaos Cults that fester on those Imperial worlds where the Emperor's servants are too lax in upholding Imperial rule. The cult that had fomented the revolt was itself affiliated with some of the Imperium's most dangerous opponents: the Heretic Astartes of the Traitor Legions. Through means unknown, the cult was able to call upon its dark master: Varakh'Lorr, a Dark Apostle of the Word Bearers Traitor Legion and the lord of a particularly active warband of his dark brethren. As Lord of the Scribed Blade warband, Varakh'Lorr had already devastated seven Imperial worlds on the border of the Crimson Stars and put their populations to the sword, sacrifices to his Dark Gods to fuel his transformation into a Daemon Prince of Chaos Undivided.It would seem that through sorcerous means -- or the arcane and techno-heretical knowledge of those Magi of the Dark Mechanicum loyal to the Scribed Blade -- the insurgents were able to force the Machine Spirits (artificial intelligences) of several Adamant Citadels to shut down, leaving them defenceless against the frenzied mob that stormed their walls. Once overrun, those same Dark Adepts took control of the Adamant Citadels and turned their impressive firepower against Donatos' defenders, forcing them to retreat. It was only with his defences already breached and the involvement of the Heretic Astartes confirmed that Governor Gnossul realised how perilous the situation was.Almost immediately, the Governor ordered his Astropaths to send out a distress call. With the Adamant Citadels now in the hands of the enemy, the hordes of Chaos Cultists, Renegade Planetary Defence Militia and Chaos Space Marines spilled out of the northern industrial zone. Where possible, the remaining Loyalist PDF regiments and Adeptus Arbites companies resisted for as long as they could, fighting defensive sieges and delaying actions in order to bleed the foe and hold out long enough for Imperial reinforcements to arrive. With a sizeable army gathered around him, Governor Gnossul's palace became one of the principal Loyalist pockets of resistance.Thanks to the sacrifice of the entire 19th Regiment of Donatos Planetary Defence Militia, the enemy's advance was blunted: infiltrating the Peninsulum Manufactorii through a labyrinth of decommissioned waste evacuation pipes, the troops of the 19th were able to destroy one of only two generatorium sites charged with delivering power to the Adamant Citadels. Bereft of power, some fortresses were even destroyed by the fatal backlash of energy caused by the Manufactorii's destruction. All of the Adamant Citadels south of Donatos' equator shut down, leaving only the Valle Electrum to power the remaining Citadels.With their advantage lost, the Traitors had to fight hard for each sector and hive city they took. After many solar weeks of siege, the Governor's Palace was eventually overrun. Governor Gnossul was slain and Donatos' astropathic choir was captured by the Heretic Astartes. As the Loyalists fell back to the Pentakhost Peninsula, holding out in Donatos Primus' primary Adeptus Arbites fortress, they were relieved to see that the Imperium had responded surprisingly swiftly to their distress call.