After an anti-Marian faction took control of the Senate, the empire was split into a mess of pieces as different generals positioned themselves for civil war. The former Caesar Marius and his family had the advantage of numbers on land but lacked the hold over Rome itself and a number of wealthy provinces, although they control the provinces beyond the Rockies and Neronia. Meanwhile, the rest of the empire was under the control of the Senate and its Committee, giving them greater resources at sea and the legitimacy of control. Neither side had clear control over the outcome of the war.
For the time being, a timeline of events in the civil war suffices to outline its procession and explain its outcome. However, first a brief summary of the military and political situation toward the beginning of the civil war is needed.
Unlike the Senate, Caesar Marius Silanus started with the disadvantage of having a less industrial power then Core Provinces. As for armies, Marius began the war with twenty-one legions, leaving him in control of half of the forty legions that constituted the professional branch of the Elysium army at the time. He had little trouble swelling his forces by another five legions within the first decade of the civil war.
With more than two-thirds of citizens, the Senate controlled the largest pool of recruits for the legion. Furthermore, the Senate had more than a hundred thousand trainees in the Castella Martiana, the exclusive training ground of the Legion. It had a standing army of 19 legions and had begun to field levies of troops armed with simpler weapons. A large fraction of the armies of the Senate were its non-professional soldiers, largely armed with polytrahoi (repeating crossbows) and lighter armor.
With control over the capital, the Senate maintained an element of legitimacy that Marius could not muster but they needed this support to mitigate the effect of their revolution against the emperor. Many common citizens and noble citizens saw the emperor as the symbol of Elysium and continued to be entirely unwilling to support those who would overturn his lawful authority.
The war was characterized by a more widespread adoption of firearms in combination with more traditional bladed weapons such as spears and swords. Armies were built around mass infantry units armed with the newly created smoothbore Flintlock muskets and bayonets. Light cavalry was reduced primarily for reconnaissance, detection, and tactical communications, while heavy cavalry was reduced as a tactical reserve and deployed for shock attacks. The artillery obtained fire support and played the main role in siege warfare. Strategic warfare in this period focused on control of key fortifications positioned to dominate neighboring regions and roads, with prolonged sieges a common feature of armed conflict. Military logistics were the deciding factor on several fronts, as armies became too large to stabilize on prolonged campaigns by harvesting alone. Military supplies are stored in centralized locations and distributed by baggage trains that were highly vulnerable to enemy raids. Armies were generally unable to sustain combat operations during the winter and normally established winter quarters in the cold season, resuming their campaigns with the return of spring.
At the time of the Civil War, the Star Forts covered practically the entire territory of the Empire. During the battles at Kiowanus and Faunina, the Senatorial forces found it necessary to capture Star Forts, something that had never been done before and was considered impossible at the time. However, they tried and, with the help of two Testudos, they managed to get through the front door and take it. Battles set in Star Forts became a defining feature of the war, seeing some of the biggest skirmishes, so the taking of a Star Fort was almost synonymous with the Civil War itself. Throughout the course of the war, more than 200 of these forts were besieged and taken, with dozens of them completely destroyed in the process. Because both sides had access to numerous Testudos, literally neither side was sufficiently fortified.
Weapons development also accelerated rapidly during this time. Both sides, wanting to gain a strategic advantage in the war, went to great lengths to build new, innovative, and as powerful weapons as possible. For example, naval engineers at Neronia saw the effectiveness of armed Amplavis, the newly created Navis
Armaturas (Galleons) differed from older types primarily by being longer, lower and narrower, with a square rather than round stern, and by having a nose or head projecting forward from the bow below the level of the forecastle. Amplavis were usually lightly armed and used to carry cargo, while Armaturas were purpose-built warships and were stronger, more heavily armed, and also cheaper to build (five Armaturas might cost around the same as three Amplavis) and were therefore a much better investment for use as vital transport or warships.
In addition, the tactics and techniques were evolving to better fight these battles. The most notable of these innovations was the development of a new style of hand-to-hand fighting by Senator General Marcus Publius Pugnatus. Called Deluctatis based on Pankration, a mixed martial art from ancient Greece, it made it highly effective in close combat. The deluctatis fists allow clenched fists and fights with kicks, finger punches, knee strikes and head butts. As a relatively simple fighting style, any able-bodied soldier could learn it in less than a month, something that senatorial forces benefited from during urban battles, which were very common during the war.
The two nations also developed their own unique methods of government during this time period. The Senatorial Empire retained its Senate, although it was increased to 1,000 members. Special governors, former senators, were produced as provincial heads and continued the consular system of maintaining national federations within the state. However, these Consuls became more important with the creation of a second parliamentary organization, the Consular Congress, which assumed the executive powers once held by the government. In contrast, in the Imperial Empire, a Praetorian Council was founded to support the Emperor and offer a measure of representation for the population. This, unlike the Congress, was highly unpopular with most of Elysium's inhabitants and was a continual source of pain for the Imperials.
By 2110, the fires of the Civil War had died down somewhat and a stable but fluctuating border soon emerged along the front line, with constant comings and goings over the last several decades. The populations of both sides never got used to this constant state of war and resentment towards both governments only increased over time until finally, in the Saturnalia of 2115 AUC (1362 AD), in the vicinity of Civis Caocia. Fed up with endless fighting, legionnaires on both sides began to question the authority of their officers. But not only the soldiers, but even many officers, refused to continue fighting. The riot initially broke out in Caociana and Magnum Fluvius, spreading rapidly; Soldiers began chanting anti-war slogans and gathering in assemblies. Quickly, the movement spreads throughout the army, reaching its peak between the end of May and the beginning of June 2116.
More than half of the units deployed on the front for both sides will be affected, with special incidence in the units of infantry; some officers are attacked by their men being surrounded officers before being executed by the main rebel officers several units even announce their intention to march on the respective capital: Aureum Ostium or Augusta Elysium. If we add to this deep discontent, the exhaustion due to the terrible combat conditions, the incessant fighting, the deplorable living conditions and incidents such as the Second Battle of Colonia Prima Memphina, where on the night of April 24 to 25. A Senatorial recruit is killed by an old Imperial legionnaire, only to discover that it is his own son. Such events were fuel for the fire of military discontent. Who despite their burning desire for peace, most soldiers continue to identify themselves as true patriots. They only intend to modify the conditions in which they fight, turning war into something less arbitrary and more humane. Thus, although they refuse to return to combat, they continue to defend their positions until the end of the altercations. The mutinies were mainly protests by the soldiers against the conditions at the front and against the operations of the high command, although they had
also generalized demands for a negotiated peace. The soldiers insisted that their sacrifice should be proportional to the desired military objectives.
Things did not change until the rebels chose Marcus Publius Pugnatus as their leader. Pugnatus, eager for change, spent a long time contemplating what he could do to end the suffering of his people. Meeting with his loyalists one day, he presented the radical idea of simply claiming the Imperial throne from the people of the Empire. His own popularity and his position were higher and it seemed that such a thing might be possible. Having already had his loyals spread the message, the general boldly asked the people to unite behind him as the new Emperor. Within days, the Senate House in Elysium Augustus and Provincial/Imperial Palace in Aureum Ostium were stormed by angry citizens and both governments forced to give up power to the General.