The Battle of Sudentor was one of the final battles of the Circum-Pacific War. It was fought between a coalition of Osean and Yuktobanian forces and the Belkan Grey Men (who also had some Osean and Yuktobanian warmongers on their side).
Prelude
It was revealed that the Grey Men had a plot to use the V2 MIRV missile, which, after launching and separating into multiple warheads, could obliterate half of all the major cities in either Osea or Yuktobania. It was deployed to the Strategic Orbital Linear Gun (SOLG), an orbital weapons platform developed during the Belkan War that was sent into orbit.
With this information in hand, Osean President Vincent Harling and Yuktobanian Prime Minister Seryozha Viktorovich Nikanor performed a joint speech calling for peace between Osea and Yuktobania. They requested that both their armies help the leaders' allies, the Razgriz Air Command Squadron, with the squadron's attack on a Grunder Industries facility in Sudentor where the controls for the SOLG were held inside a large tunnel.
Summary
By the time the Razgriz Squadron made it to Sudentor, many Osean and Yuktobanian troops were already in the area. Multiple units from both countries joined Razgriz, including Oka Nieba, a Yuktobanian AWACS. In response, Grunder Industries requested assistance from the countries' forces as well, and offered them a V1 tactical nuclear weapon in exchange. AA artillery and defensive pillboxes belonging to Osea opened fire on the coalition forces, while the coalition's tanks and helicopters attempted to enter the area. With close air support from Razgriz, the pillbox line and AA artillery were destroyed. Partly through the battle, air units, including Allen C. Hamilton, all began to engage the Razgriz Squadron at once. The coalition air units moved to defend them while the ground forces and helicopter units began to open the facility's tunnel.
The tunnel was eventually opened, and the entire Razgriz Squadron flew in through one side (with Hamilton in hot pursuit) while Jack Bartlett came in through the other side; they needed to destroy both of the system cores, and once they did so, had to escape the tunnel fast as the shutters began to close. More air units allied with the Grey Men came in from the other side, but all of them were eventually trapped inside as the Razgriz Squadron and Bartlett escaped.
Result
The battle was a major success for the two countries, as the enemy units were mostly crushed and peace had finally been restored once more. Virtually none of the coalition forces were damaged in the battle.
The destruction of the control facility in the tunnel, however, did not completely remove the threat of the SOLG. It was programmed to descend onto Oured, the capital of Osea, and crash into the ground to detonate the V2 if control was cut off from the facility. Operation: Arcadia was quickly formed to deal with the threat.