Rich in vital gas resources, the Sigma 13 system has been contested by a number of groups since its discovery in 60 AS. Conflict reached a fever pitch when the system became one of the more fiercely contested prizes during the 80-Years War between the Gas Mining Guild (GMG) and Rheinland. Using speed and a thorough knowledge of the territory, the GMG managed to push back the Rheinland forces, finally obliterating the bulk of the Rheinland Navy at the Battle of the Yanagi Nebula. Since that time the system has been almost exclusively under GMG control, and the Gas Miner Naha has provided support for the GMG's extensive mining operations.