Star Wars: Empire at War is a 2006 real-time strategy video game developed by Petroglyph Games and published by LucasArts. Set between Episode III and Episode IV, it focuses on the fledgling struggle between the Empire and the Rebels. It uses Petroglyph's game engine Alamo. In October 2006, an expansion titled Star Wars: Empire at War: Forces of Corruption was released. On May 31, 2014, online functionality, including network multiplayer and wireless chat, was discontinued after Glu Mobile's purchase of GameSpy and the subsequent shutdown of all game servers. As of September 1, 2017, the multiplayer has been re-enabled on the Steam version as well as workshop support being added. Gameplay There are three game modes: storyline-based Campaign, Galactic Conquest and Skirmish. Battles can take place on a planet (land battle) or above the planet (space battle). Land battles are fought with infantry and ground vehicle units, while space battles are fought with starfighter squadrons and large spacecraft. Galactic Conquest is the sandbox campaign, in which the player controls either the Rebel Alliance or the Empire. A weaker, neutral faction of Pirates exists, but makes no attempt to battle the Rebels or Empire unless attacked. 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. Grand strategy, production, and resource management are facilitated through a three-dimensional galactic map. The player receives funds from planets they control and from mining facilities. Credits are used to research technology, build defenses and vehicles, and train troops. 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). When enemy forces meet (either fleets in space or ground forces landing an enemy planet) a battle ensues. The player(s) can use only the equipment they brought to the battle (be it an X-wing squadron or an AT-AT). Factions must battle across both space and land maps. The defender may also use any buildings (land) or their space station (space) if they have constructed them. In each battle, each side may only have a certain number of units on the field at a time; the rest are retained as