The battle happened quicker when anything else. The forces of batarians and Inquisitors over helmed the security and destroyed all Armories quicker when anyone else. SGA operatives were quick enough to get to council and save them by transporting to their main planet. The Oblivion Hunters fleet entered the orbit and descended to Citadel. Using M85 Megalodons it was clear that Inquisitors would be pushed back, but it just had to take time. Inquisitors weakened the defenses and Megalodon war Machines couldn't do a lot. It was when the Alliance Fleet entered the orbit and started the bombardment of Inquisitor fleet. Asari Dreadnought arrived moments later and blasted at the upper presidium to take down the point from where they were coming. The ring broke nearly in half. The citadel was weake