In the late 2010s, anti-Osean sentiment grew amongst those in the Erusean military, who believed Osea had constructed the International Space Elevator in order to expand its influence over the Usean continent. The Arsenal Bird aerial warships were also developed for this purpose and deployed to the airspace surrounding the elevator. As part of the agreement, Osean military and IUN forces in the form of aircraft and naval warships were stationed on the continent to protect the structure. In the early 2010s, Osea, with former President Vincent Harling spearheading the effort, reached an agreement with the various Usean nations for the construction of the International Space Elevator in the Gunther region to supply energy to countries on the continent devastated by Ulysses 1994XF04 and the Continental War of 2003-2005. In December, a ceasefire was signed at the Expo City Conference, officially ending the war. In late October, a coalition of Osean and Erusean forces shot down both Arsenal Bird Justice and later two highly advanced UAVs, recapturing the Lighthouse. Д¬oncurrent with Farbanti's capture later that month, both Osea and Erusea's satellite networks were destroyed, throwing Usea into chaos and sparking civil war in Erusea. After dealing with the Alicorn, Osean forces continued pushing west towards Farbanti. In early September, their advance was slowed when Captain Matias Torres rebelled against Erusea and threatened to use the Erusean submerisble aviation cruiser Alicorn to end the war himself by drastic measures. 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.' вЂ• Schroeder

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