During the next skirmish, the pilots encountered Milliardo, who went straight for Quatre, considering him the "brain". Fortunately, the pilots stuck together, and Milliardo eventually fled the battle. In a desperate move, Peacemillion was crashed into Libra, disabling the main cannon and allowing Quatre, Trowa, and Duo to board the ship. Quatre soon located the mobile doll control room, where he found Dorothy waiting for him, rapier in hand. Using the ZERO system to enhance her abilities, she challenged him to a duel, and as they fought, she challenged his motives for battling as well.

The duel ended when she ran her rapier through Quatre's side. Before passing out, he lectured Dorothy on his reasons for fighting, even suggesting that they fight for the same reasons. A lot of what he said was reminiscent of the speech Trowa gave during Quatre's incident with the ZERO System, once again showing just how deeply those words had touched him.

At last, Trowa showed up in the control room and disabled the mobile doll system, leaving Dorothy behind despite Quatre's request to save her. He returned Quatre to his Gundam, and the two of them, together with Duo, left the battleship.

With Libra falling apart, large chunks of debris were falling toward Earth, threatening to cause massive amounts of damage. Joined by the Maganac Corps, the pilots attempted to destroy one of the larger blocks with minimal success. Fortunately, Wufei delivered Wing Zero's buster rifle to Heero, who then destroyed the block and brought an end to what would later be called the Eve Wars. The Earth Sphere United Nation was formed shortly thereafter, and Relena Peacecraft (now going by Relena Darlian once again, using the last name of her late adopted father) was elected to the position of Vice Foreign Minister. Under her guidance, the ESUN began disarmament.

It's assumed that Quatre returned home after his injuries were healed, which is the point I'd be taking him from, if accepted.

» Mobile Suit Gundam Wing: Endless Waltz
A year after the Eve Wars, it was decided that the Gundams were no longer needed, so Quatre devised a plan to send them into the sun on a disposal block, thus destroying them. Save Wufei, all of the pilots sent their Gundams to him. However, only a day later, Mariemaia Khushrenada, Treize's seven year old daughter and puppet for the Barton Foundation, declared war on the ESUN. Quatre once again utilized the help of the Maganac Corps to retrieve the disposal block. After modifying their engines, Quatre sent the Gundams back to Earth. He, Trowa, and Duo fought the Mariemaia Army in Brussels alongside Milliardo (once again going by Zechs Marquise) and Noin, who were now part of an organization known as Preventers, formed to prevent world and space conflicts from escalating. The five of them were able to disable the army's mobile suits without killing any of the soldiers.

Meanwhile, Heero was able to get through the defenses set up at Barton Foundation leader Dekim Barton's shelter, where Mariemaia was taking refuge, using Wing Zero's beam cannon. When it became clear that Dekim wasn't doing this to uphold Treize's ideals, civilians stood and rebelled against him. Astonished, he called for Mariemaia to rise as ruler of the Earth Sphere. When the girl complied, she was slapped by Relena and brought to her senses. Unwilling to let his granddaughter be brainwashed, Dekim trained a gun on Relena, but when he pulled the trigger, Mariemaia jumped in the way. Dekim was unconcerned and attempted to take another shot at Relena, but before he could even try, he was shot by a Treize loyalist. Following his death, the rest of Mariemaia's Army, who were all Treize loyalists, surrendered, bringing an end to the conflict.

Together with Trowa and Duo, Quatre self-detonated their suits, with Heero and Wufei destroying theirs separately. Having taken full control of the Winner Corporation, Quatre's first order of business was completing the construction of Colony X-18999, which would have been used in Operation Meteor.