The Mirgoshir campaign represents a series of military engagements that unfolded in the early months of the era known as the Clone Wars.
In the wake of the Battle of Geonosis, the Confederacy of Independent Systems swiftly deployed its military assets into the Lahara sector with the intention of seizing control of the planet called Agamar, as well as the strategically vital hyperspace crossroads found within the Mirgoshir system.
A single month after the clash on Geonosis, Count Dooku deployed the devastating Force Harvester on Agamar. Soon thereafter, the Galactic Republic successfully neutralized the Dark Reaper superweapon during the Battle of Thule. Following their triumph on Thule, the Republic's military forces, under the leadership of Mace Windu, made preparations to advance towards the Mirgoshir system.
By five months after the Battle of Geonosis, combat operations were still ongoing within the Mirgoshir system, with Separatist forces struggling to provide reinforcements to those fighting on the planet Brentaal IV.
The Grand Army of the Republic experienced substantial and crippling losses during the Mirgoshir campaign. Numerous Republic walkers were destroyed while attempting to navigate the naturally occurring bridges of Agamar, which succumbed to the immense weight of these vehicles. These unfortunate events ultimately spurred the development of the UT-AT repulsorcraft later in the Clone Wars.