Question: During which span of years was the war where UN troops approached the Yalu River?

title: The King's Daughters
text: The King's Daughters () is a 2000 French period drama film directed by Patricia Mazuy. It was screened in the Un Certain Regard section at the 2000 Cannes Film Festival. It was adapted from the novel "La maison d’Esther" by Yves Dangerfield.

title: DUKW
text: Designed by a partnership under military auspices of Sparkman & Stephens and General Motors Corporation (GMC), the DUKW was used for the transportation of goods and troops over land and water. Excelling at approaching and crossing beaches in amphibious warfare attacks, it was intended only to last long enough to meet the demands of combat. Surviving DUKWs have since found popularity as tourist craft in marine environments.

title: Mount Hood
text: The last three eruptions at Mount Hood occurred within the past 1,800 years from vents high on the southwest flank and produced deposits that were distributed primarily to the south and west along the Sandy and Zigzag rivers. The last eruptive period took place around 220 to 170 years ago, when dacitic lava domes, pyroclastic flows and mudflows were produced without major explosive eruptions. The prominent Crater Rock just below the summit is hypothesized to be the remains of one of these now - eroded domes. This period includes the last major eruption of 1781 to 1782 with a slightly more recent episode ending shortly before the arrival of the explorers Lewis and Clark in 1805. The latest minor eruptive event occurred in August 1907.

title: Chunggang County
text: Chunggang County is a "kun", or county, in northern Chagang province, North Korea. It was originally part of Huchang county in Ryanggang, and for that reason older sources still identify it as being part of Huchang. The county seat was originally known as Chunggangjin (중강진), but is now known as Chunggang "ŭp". Chunggang looks across the Yalu River at China, and borders Ryanggang province to the south.

title: Usi County
text: Usi County is a "kun", or county, in westernmost Chagang Province, North Korea. It looks across the Yalu River into the People's Republic of China. Within North Korea, it borders Chosan and Kopung to the east, Songwon to the south, and North Pyongan Province's Pyoktong county to the west. Originally part of Pyoktong, it was made a separate county in 1952 as part of a general reorganization of local government; in 1954, it was transferred from North Pyongan to Chagang.

title: Dissolution of the Soviet Union
text: The Alma-Ata Protocol also addressed other issues, including UN membership. Notably, Russia was authorized to assume the Soviet Union's UN membership, including its permanent seat on the Security Council. The Soviet Ambassador to the UN delivered a letter signed by Russian President Yeltsin to the UN Secretary-General dated December 24, 1991, informing him that by virtue of the Alma-Ata Protocol, Russia was the successor state to the USSR. After being circulated among the other UN member states, with no objection raised, the statement was declared accepted on the last day of the year, December 31, 1991.

title: Siege of Ninety-Six
text: The Siege of Ninety Six was a siege in western South Carolina late in the American Revolutionary War. From May 22 to June 18, 1781, Continental Army Major General Nathanael Greene led 1,000 troops in a siege against the 550 Loyalists in the fortified village of Ninety Six, South Carolina. The 28-day siege centered on an earthen fortification known as Star Fort. Despite having more troops, Greene was unsuccessful in taking the town, and was forced to lift the siege when Lord Rawdon approached from Charleston with British troops.

title: First Battle of Panipat
text: When Ibrahim's army arrived, he found the approach to Babur's army too narrow to attack. While Ibrahim redeployed his forces to allow for the narrower front, Babur quickly took advantage of the situation to flank (tulghuma) the Lodi army. Many of Ibrahim's troops were unable to get into action, and fled when the battle turned against Ibrahim. Faced with musket fire, cannon fire and cavalry attacks from all sides, Ibrahim Lodi fought and died with 6,000 of his remaining troops.

title: Al-Qubeir massacre
text: The Al-Qubeir massacre (), also known as the Hama massacre, occurred in the small village of Al-Qubeir near Hama, Syria, on 6 June 2012 during the country's ongoing civil conflict. Al-Qubeir is described as a Sunni farming settlement surrounded by Alawite villages in the central province of Hama. According to preliminary evidence, troops had surrounded the village which was followed by pro-government Shabiha militia entering the village and killing civilians with "barbarity," UN Secretary-General Ban Ki-moon told the UN Security Council.

title: Namibia
text: South West Africa became known as Namibia by the UN when the General Assembly changed the territory's name by Resolution 2372 (XXII) of 12 June 1968. In 1978 the UN Security Council passed UN Resolution 435 which planned a transition toward independence for Namibia. Attempts to persuade South Africa to agree to the plan's implementation were not successful until 1988 when the transition to independence finally started under a diplomatic agreement between South Africa, Angola and Cuba, with the USSR and the USA as observers, under which South Africa agreed to withdraw and demobilise its forces in Namibia. As a result, Cuba agreed to pull back its troops in southern Angola sent to support the MPLA in its war for control of Angola with UNITA.

title: Modern history
text: The Cold War saw periods of both heightened tension and relative calm. International crises arose, such as the Berlin Blockade (1948–1949), the Korean War (1950–1953), the Berlin Crisis of 1961, the Vietnam War (1959–1975), the Cuban Missile Crisis (1962), the Soviet war in Afghanistan (1979–1989) and NATO exercises in November 1983. There were also periods of reduced tension as both sides sought détente. Direct military attacks on adversaries were deterred by the potential for mutual assured destruction using deliverable nuclear weapons. In the Cold War era, the Generation of Love and the rise of computers changed society in very different, complex ways, including higher social and local mobility.

title: American Revolutionary War
text: American Revolutionary War: The last British troops departed New York City on November 25, 1783, marking the end of British rule in the new United States.

title: Boutros Boutros-Ghali
text: Boutros-Ghali's term in office remains controversial. In 1992, he submitted An Agenda for Peace, a suggestion for how the UN could respond to violent conflict.  He set three goals: the UN to be more active in promoting democracy; the UN conduct preventive diplomacy to avert crises; expand the UN role as peacekeeper. Although the goals were consistent with those of American President George H. W. Bush, he never nevertheless clashed repeatedly with the United States, especially with his efforts to involve the UN more deeply in the civil wars in Somalia 1992 in Rwanda in 1994. The United States refused to send troops under UN leadership.  Boutros-Ghali was criticised for the UN's failure to act during the 1994 Rwandan Genocide, which officially left over one million people dead, and he appeared unable to muster support in the UN for intervention in the continuing Angolan Civil War. One of the hardest tasks during his term was dealing with the crisis of the Yugoslav Wars after the disintegration of the former Yugoslavia.  The UN peacekeeping force was ineffective in Bosnia, forcing the intervention by NATO in December 1995.  His reputation became entangled in the larger controversies over the effectiveness of the UN and the role of the United States in the UN.

title: Third Anglo-Burmese War
text: At this time, except that the country was one of dense jungle, and therefore most unfavourable for military operations, the British knew little of the interior of Upper Burma; but British steamers had for years been running on the great river highway of the Irrawaddy River, from Rangoon to Mandalay, and it was obvious that the quickest and most satisfactory method of carrying out the British campaign was an advance by water direct on the capital. Further, a large number of light-draught river steamers and barges (or flats), belonging to the Irrawaddy Flotilla Company under the control of Frederick Charles Kennedy, were available at Rangoon, and the local knowledge of the company's officers of the difficult river navigation was at the disposal of the British forces.Major-General, afterwards Sir, Harry Prendergast was placed in command of the invasion. As was only to be expected in an enterprise of this description, the navy as well as the army was called in requisition; and as usual the services rendered by the seamen and guns were most important. The total effective force available was 3,029 British troops, 6,005 Indian sepoys and 67 guns, and for river service, 24 machine guns. The river fleet which conveyed the troops and stores was composed of more than 55 steamers, barges, and launches, etc.

title: Linjiang Yalu River Bridge
text: The Linjiang Yalu River Bridge () is a bridge over the Yalu River, connecting Linjiang City, Jilin Province, China, with Chunggang County, Chagang Province, North Korea. It was built by the Japanese in 1938 and Linjiang Border Post is located there. A little downstream from the bridge is Yunfeng Dam.

title: Korean War
text: With Lieutenant-General Matthew Ridgway assuming the command of the U.S. Eighth Army on 26 December, the PVA and the KPA launched their Third Phase Offensive (also known as the "Chinese New Year's Offensive") on New Year's Eve of 1950. Utilizing night attacks in which UN Command fighting positions were encircled and then assaulted by numerically superior troops who had the element of surprise, the attacks were accompanied by loud trumpets and gongs, which fulfilled the double purpose of facilitating tactical communication and mentally disorienting the enemy. UN forces initially had no familiarity with this tactic, and as a result some soldiers panicked, abandoning their weapons and retreating to the south. The Chinese New Year's Offensive overwhelmed UN forces, allowing the PVA and KPA to conquer Seoul for the second time on 4 January 1951.

title: Korean War
text: After secretly crossing the Yalu River on 19 October, the PVA 13th Army Group launched the First Phase Offensive on 25 October, attacking the advancing UN forces near the Sino-Korean border. This military decision made solely by China changed the attitude of the Soviet Union. Twelve days after Chinese troops entered the war, Stalin allowed the Soviet Air Force to provide air cover, and supported more aid to China. After decimating the ROK II Corps at the Battle of Onjong, the first confrontation between Chinese and U.S. military occurred on 1 November 1950; deep in North Korea, thousands of soldiers from the PVA 39th Army encircled and attacked the U.S. 8th Cavalry Regiment with three-prong assaults—from the north, northwest, and west—and overran the defensive position flanks in the Battle of Unsan. The surprise assault resulted in the UN forces retreating back to the Ch'ongch'on River, while the Chinese unexpectedly disappeared into mountain hideouts following victory. It is unclear why the Chinese did not press the attack and follow up their victory.

title: Korean War
text: UN forces retreated to Suwon in the west, Wonju in the center, and the territory north of Samcheok in the east, where the battlefront stabilized and held. The PVA had outrun its logistics capability and thus were unable to press on beyond Seoul as food, ammunition, and matériel were carried nightly, on foot and bicycle, from the border at the Yalu River to the three battle lines. In late January, upon finding that the PVA had abandoned their battle lines, General Ridgway ordered a reconnaissance-in-force, which became Operation Roundup (5 February 1951). A full-scale X Corps advance proceeded, which fully exploited the UN Command's air superiority, concluding with the UN reaching the Han River and recapturing Wonju.

title: Korean War
text: After the first two months of the conflict, South Korean forces were on the point of defeat, forced back to the Pusan Perimeter. In September 1950, an amphibious UN counter-offensive was launched at Inchon, and cut off many of the North Korean attackers. Those that escaped envelopment and capture were rapidly forced back north all the way to the border with China at the Yalu River, or into the mountainous interior. At this point, in October 1950, Chinese forces crossed the Yalu and entered the war. Chinese intervention triggered a retreat of UN forces which continued until mid-1951. After these dramatic reversals of fortune, which saw Seoul change hands four times, the last two years of conflict became a war of attrition, with the front line close to the 38th parallel. The war in the air, however, was never a stalemate. North Korea was subject to a massive bombing campaign. Jet fighters confronted each other in air-to-air combat for the first time in history, and Soviet pilots covertly flew in defense of their Communist allies.

title: Yalu River
text: The Korean side of the river was heavily industrialized during the period of Japanese rule (1910 -- 1945), and by 1945 almost 20% of Imperial Japan's total industrial output originated in Korea. During the Korean War, the movement of United Nations troops approaching the river precipitated massive Chinese intervention from around Dandong. In the course of the conflict every bridge across the river except one was destroyed. The one remaining bridge was the Sino -- Korean Friendship Bridge connecting Sinuiju, North Korea to Dandong, China. During the war the valley surrounding the western end of the river also became the focal point of a series of dogfights for air superiority over North Korea, earning the nickname ``MiG Alley ''in reference to the MiG - 15 fighters flown by the combined North Korean, Chinese and Soviet forces.

Answer: 1950–1953)