With the help of the LRSSG, Osea used Stonehenge to shoot down an Arsenal Bird in mid-August, allowing Osean forces to advance further east. Finally discovering one, Osea created the Long Range Strategic Strike Group (LRSSG) to exploit the blind spot and carry out attacks within Erusean territory. Osea conscripted various criminals with flying experience to test the length of the radar net for vulnerabilities, creating penal units such as Spare Squadron. The Oseans quickly discovered Erusea had set up a UAV auto-intercept system using a radar net spanning the length of the eastern front of the continent. In response, the Osean Federation deployed its forces alongside the IUN.
After capturing the International Space Elevator, Erusea gained control of the two Arsenal Birds tasked with defending it, granting them air superiority.
The war officially began on May 15, 2019, as Erusea launched attacks on Osean home ports using container-launched UAVs and occupied most of the Usean continent in a surprise attack. It is the main focus of the story campaign in Ace Combat 7: Skies Unknown.
The Lighthouse War, also known as the Second Continental War or Second Usean Continental War, was a large-scale conflict between the countries of Osea and Erusea on the continent of Usea. 'It's difficult to say which side pulled the trigger first.' ― Schroeder
