As the evil forces grew, the grey-robed wizard Gandalf became suspicious, fearing that this was actually a sign of Sauron's comeback. So, in 2063, he dared to personally break into the gates of Dogurdu to investigate, but Sauron fled, temporarily evacuated Dogurdu, and lurked to the East, so that his identity was not revealed. Since then, Zhongzhou has gained a long period of peace, known in history as vigilance for peace. The vigilance ended in 2460 A.D. Sauron, a year in which Sauron returned to Dogurdu with more powerful forces, and in order to fight the resurgence of the Shadows, the Wise Men formed the White Path Society, which included wizards and elven lords. At this time, Smitho also killed Diego and obtained the Ring, and this ring was exactly what Sauron had been looking for, and later roselowrian's elves also learned of Sauron's existence and increased their vigilance. Around 2510, the Rohans allied themselves with Gondor on the battlefield and defeated the invaders, but at the same time they saw a white mist-like object heading towards the dordo fortress, and they raised their vigilance. The western part of the subsequent Middle-earth continent was in an unusually calm state, and Dordogo's power was getting stronger and stronger.
In 2841, the exiled King of the Dwarves of Durham and one of the holders of the Seven Precepts of the Dwarves, Celion II, was captured alive by Sauron's minions while passing through the edge of the Black Forest. He was then taken to the dungeon of Dogurdu, where he was tortured and the Dwarven Ring was taken away. However, Selein II still hid two heirlooms: Terrol's map and the key to the Secret Gate of lonely mountains. He survived for years in dogurdu's dungeon, mentally shattered, and finally forgot his name. In 2850, Gandalf once again disguised himself to infiltrate Dogurdu to investigate, and he discovered the dying Seleine, obtained the map and key from him, and finally confirmed that The Shadow of Dogurdu was not a ring, but a reconverged Sauron.
In 2851, the White Council held a meeting in response to Gandalf's discovery, and Gandalf advocated an attack on Dogurdu, but Speaker Saruman dismissed his opinion, declaring that there was no need to fear Sauron who had lost the Supreme Ring; it was not until 2941 that Saruman finally agreed to attack Dogurdu. It is said that thanks to Saruman's careful planning, the attack was able to successfully drive Sauron out of Dogurdu; however, Sauron's retreat was deliberate, and he had previously run Mordor's stronghold through the Nine Commandments. As soon as Dogur was lost, he fled to Mordor, where he made a comeback with greater might.
In 2951, Sauron sent three spirits led by Kokhamur to retake Dogurdu. Khamur then remained here and took charge of Dogurdu as Sauron's aide-de-camp. In March 3018, Dogurdu's scouts discovered Gollum imprisoned in the Black Forest Kingdom ruled by Selandduil; on June 20, Dogurdu's Oak army sneaked up on the Sylvan Elves of the Black Forest Kingdom, leading to Gollum's escape.
During the Battle of the Rings in the Third Age of 3018-3019, Dogur launched several major battles in the Northern Battlefield, causing heavy damage. On 11, 15 and 22 March 3019, the armies of Dogurdu launched three attacks on the Forest of Rose Roh ryan, and although the beautiful forest on the border of Loth Rorian was severely damaged, all three offensives were repelled by the mighty elves and Galadreal. At the same time, the Black Forest Kingdom of Selandduy was also invaded by Dogurdu, and the battle in the forest lasted for a long time, and the fire caused great damage, but in the end Selandduy won. After the destruction of the Supreme Ring and the defeat of Sauron, the Lords of Loth Royne, Kellerborn and Garadreel, led their army across the Anduin River by boat and launched a counterattack against Dogurdu. They captured Dogurdu, Garadriel tore down its walls, destroyed its dungeons, and finally purified the forest where darkness had been growing for so long.