Imperium of Terra

The Imperium of Terra was the galactic government and successor government of the Terran Empire, formed 30,900 before the battle of Yavin. Often simply called the Imperium, it was amongst the earliest interstellar governments in the Galaxy, where after advancing to hyperdrive technology and improved starships allowed effortless colonization of Sol system and its nieghbouring star systems. By the time of Expansionist era, the Imperium had over 10,000 years to improve and were amongst the most advanced space-faring governments in the Galaxy.

However in 19,560 BBY, a major sect of Imperium colonies broke away from Imperium of Terra and began to form the Gaia Independence. Under the Imperium Constitution, this is high treason and thus the Imperium Civil War erupted between the two within Imperium territory that continued well into the Clone Wars.

Origins
Origins of Imperium of Terra began in the year 30,900 BBY after the Terran Empire gained the technoloy to perform system travel, the act of allowing one to travel within their solar system within a corrosponding time frame (being from a few weeks to months). Achieving this aspect soon allowed the re-organization into the Imperium of Terra under the Caesar of Tera who soon transformed the title into the Emperor of Terra. Gaining this act soon allowed them colonized the many planets in the Sol system, including 2 habitable worlds (Neptune and Mars) that required no external equipment. However, 4 other planetary objects (Mercury, Venus and Uranus required specialized equipment to traverse their hostile terrain. The Emperor had colonized Neptune and Mars solely for research and development sciene, while the other three are mining worlds due to their rich in metals and minerals.

The Martian & Neptunic Wars
Upon beginning their colonization of the planet of Mars, the coloniam encountered a hostile presence designated as the Martians. The Martians assaulted and extermined the FOB of coloniam and either killed or taken hostage of its personel. Due to actions and aggression of the Martials, the Emperor declared war on them, igniting the Martian War.

At the beginning of the Martian War, the Emperor sends in the Second Fleet, the second generation of starships to be used against the enemy Martians. Not wanting to damage the planet, the fleet is purely there as a form of supply and support in troop transport. Sending in the Terra Militare, the predessecor army to the Exercitus. The Terra Militare would then retake the former FOB of coloniam and fortified it, using it as the primary FOB in the campaign against the Martians.