Third Clavian War began when East Clavis launched a full-scale invasion of West Clavis. The Osean Federation came to the aid of the West Clavians, supplied by Solaris Global Security. In response to Osean intervention, Verusa came to the aid of East Clavis. Considered to be the continuation of the Second Clavian War 70 years ago, the East Clavian government aimed to reunify the peninsula.
The war quickly spread outside of the peninsula, with skirmishes between Osean and Verusan navies occurring in the Pacific and Ceres Oceans, and a major beach landing by Osean forces in the East Verusan coast.