Mauryan Revolution

The Mauryan Revolution, known locally as the War for Independence, is the first known campaign undertaken by the ancestors of what would become the modern-era Mauryan Guard Astra Militarum, when they rose in revolt to free their homeworld of Maurya from xenos occupation and would go on to become a part of the burgeoning Imperium of Man. Young men of fighting age would be drafted as a part of the Imperial Army, forming the the initial core of the Mauryan Guard, to take part in the many battles of the Great Crusade and the subsequent Horus Heresy.

Background
After hundreds of years of praetorian occupation rebel cells unleash a massive assault across the planet. Most of the hives fall to the rebels but the capitals garrison held out due to a large amount of heavy armor backing them up. This forced the rebels to storm the fortress used by them & after 3 days of combat that ended with a brutal melee fight in its hallways as the rebels surged into firing zones. Over 7 million Mauryan were killed before the last praetorian soldiers were killed and the planet free of their grasp. While the war on the planet raged the Praetorians in the orbital stations and moons quickly left or were killed by the workers around them. When Praetoria sent a second wave of soldiers on the planets personal flagship it was taken out with orbital defense batteries and swarms of fighters within 5 minutes of leaving the warp. After this Praetoria signed a treaty and officially ended the occupation of the Onkar System.