The campaign is very similar to Galactic Conquest, although the Galactic Map is gradually opened for play as the player completes scripted events and completes missions. Campaign missions build up to the plot of Star Wars and eventually, the Battle of Yavin. The storyline campaign follows a semi-open linear path, where the given side must complete sequential mission objectives (such as stealing X-wing prototypes). In land battles, a player can field more units at a time if they capture Reinforcement Points. In each battle, each side may only have a certain number of units on the field at a time the rest are retained as Reinforcements, which can be called in any time to designated areas when allowed. The defender may also use any buildings (land) or their space station (space) if they have constructed them. Factions must battle across both space and land maps. The player(s) can use only the equipment they brought to the battle (be it an X-wing squadron or an AT-AT). When enemy forces meet (either fleets in space or ground forces landing an enemy planet) a battle ensues. Each planet confers different advantages to its owner, even though some bonuses are specific to each faction (for example, controlling Kuat reduces the price of Imperial Star Destroyers by 25 percent). Credits are used to research technology, build defenses and vehicles, and train troops. The player receives funds from planets they control and from mining facilities. Grand strategy, production, and resource management are facilitated through a three-dimensional galactic map. Each faction has at least one of three broad objectives for Galactic Conquest, which vary depending on which scenario is being played: kill the enemy leader ( Mon Mothma or Emperor Palpatine), protect or destroy the Death Star, or completely remove the other faction from the campaign map.

A weaker, neutral faction of Pirates exists, but makes no attempt to battle the Rebels or Empire unless attacked. Galactic Conquest is the sandbox campaign, in which the player controls either the Rebel Alliance or the Empire. Land battles are fought with infantry and ground vehicle units, while space battles are fought with starfighter squadrons and large spacecraft. Battles can take place on a planet (land battle) or above the planet (space battle). There are three game modes: storyline-based Campaign, Galactic Conquest and Skirmish. A screenshot presenting one of the Galactic Conquest maps (playing as the Empire).

Star wars empire at war