The campaign in Armed Assault takes place on the fictional Atlantic island of Sahrani, a nation which is divided into a northern communist regime (called the Democratic Republic of Sahrani - DRS) and an oil rich southern democracy called the Kingdom of South Sahrani. The narrative begins with United States forces, after a few months of training in the south, leaving the island. The northern leader uses this moment of weakness to attack the rest of the south. The player takes on the role of one soldier in one of the platoons not rotated off the island before the conflict began. The platoons aid the Royal Army Corps of Sahrani (RACS) in fending off the more powerful neighbour's offensive being spearheaded by the Sahrani Liberation Army (SLA).