Question: Which battle happened first? Operation Overlord or the Battle of the Ch'ongch'on River?

Context paragraphs:
Operation Overlord: Operation Overlord was the codename for the Battle of Normandy, the Allied operation that launched the successful invasion of German-occupied Western Europe during World War II.  The operation was launched on 6 June 1944 with the Normandy landings (Operation Neptune, commonly known as D-Day).  A 1,200-plane airborne assault preceded an amphibious assault involving more than 5,000 vessels.  Nearly 160,000 troops crossed the English Channel on 6 June, and more than two million Allied troops were in France by the end of August.

Battle of Changshao: The Battle of Changshao was a military conflict between Qi and Lu, two major principality states in Shandong Peninsula during the Spring and Autumn Period of Zhou dynasty.  The battle happened in the January (lunar calendar) of 684 BC at Changshao.  Lu claimed the victory under the lead of general Cao Gui (曹刿).  This battle is described in detail by Zuo Qiuming in his "Spring and Autumn Commentary of Zuo", but it is not mentioned in Sima Qian's book of "Shi Ji".  This battle is considered as a classic example of winning by good military strategies, and the widely-used Chengyu of "Yi Gu Zuo Qi" was derived from this battle.

Battle of the Ch'ongch'on River: The Battle of the Ch'ongch'on River, also known as the Battle of the Ch'ongch'on () or the Second Phase Campaign Western Sector (), was a decisive battle in the Korean War, and it took place from November 25 to December 2, 1950, along the Ch'ongch'on River Valley in the northwestern part of North Korea.  In response to the successful Chinese First Phase Campaign against the United Nations forces, General Douglas MacArthur launched the Home-by-Christmas Offensive to evict the Chinese forces from Korea and to end the war.  Anticipating this reaction, the Chinese People's Volunteer Army Commander Peng Dehuai planned a counteroffensive, dubbed the "Second Phase Campaign", against the advancing UN forces.

Operation Charnwood: Operation Charnwood was an Anglo-Canadian offensive that took place from 8 to 9 July 1944, during the Battle for Caen, part of the larger Operation Overlord (code-name for the Battle of Normandy), in the Second World War.  The operation was intended to at least partially capture the German-occupied city of Caen (] ), which was an important objective for the Allies during the opening stages of Overlord.  It was also hoped that the attack would forestall the transfer of German armoured units from the Anglo-Canadian sector to the lightly screened American sector, where a major American offensive was being planned.  The British and Canadians advanced on a broad front and by the evening of the second day had taken Caen up to the Orne and Odon rivers.

Operation Perch: Operation Perch was a British offensive of the Second World War which took place from 7 to 14 June 1944, during the early stages of the Battle of Normandy.  The operation was intended to encircle and seize the German occupied city of Caen, which was a D-Day objective for the British 3rd Infantry Division in the early phases of Operation Overlord.  Operation Perch was to begin immediately after the British beach landings with an advance to the south-east of Caen by XXX Corps.  Three days after the invasion the city was still in German hands and the operation was amended.  The operation was expanded to include I Corps for a pincer attack on Caen.

Operation Totalize: Operation Totalize (also spelled Operation Totalise in recent British sources) was an offensive launched by Allied troops in the First Canadian Army during the later stages of Operation Overlord, from 8 to 9 August 1944.  The intention was to break through the German defences south of Caen on the eastern flank of the Allied positions in Normandy and exploit success by driving south, to capture the high ground north of the city of Falaise.  The goal was to collapse the German front and cut off the retreat of German forces fighting the Allied armies further west.  The battle is considered the inaugural operation of the First Canadian Army, which had been activated on 23 July.

Overlord (film): Overlord is a 1975 black-and-white film written and directed by Stuart Cooper.  Set around the D-Day invasion ('Operation Overlord'), "Overlord" is a war film about a young soldier's meditations on being part of the war machinery, and his premonitions of death.  The film was entered into the 25th Berlin International Film Festival, where it won the Silver Bear - Special Jury Prize.

American airborne landings in Normandy: The American airborne landings in Normandy were the first American combat operations during Operation Overlord, the invasion of Normandy by the Western Allies on June 6, 1944, during World War II.  Around 13,100 American paratroopers of the 82nd and 101st Airborne Divisions made night parachute drops early on D-Day, June 6, followed by 3,937 glider troops flown in by day.  As the opening maneuver of Operation Neptune (the assault operation for Overlord) the two American airborne divisions were delivered to the continent in two parachute and six glider missions.

Battle of Rednitz: The Battle of Rednitz on 22 June 910, was a decisive victory of the Magyar cavalry over the East Francian - German kingdoms armies.  The location of this battle could be not determined with 100% certitude.  The battle happened near the river Rednitz, in Franconia, near the border with Bavaria ("in confinio Bavariae et Franciae").  After the battle, the German king Louis the Child, together with the Swabian, Frankish, Bavarian and Saxonian dukes, accepted to pay tribute to the Hungarian state.

Battle at Chignecto: The Battle at Chignecto happened during Father Le Loutre’s War and was fought by 700 troops made up of British regulars led by Charles Lawrence, Horatio Gates, Rangers led by John Gorham and Captain John Rous led the navy.  This battle was the first attempt by the New Englanders to occupy the head of the Bay of Fundy since the disastrous Battle of Grand Pré three years earlier.  They fought against a militia made up of Mi’kmaq and Acadians led by Jean-Louis Le Loutre and Joseph Broussard (Beausoliel).  The battle happened at Isthmus of Chignecto, Nova Scotia on 3 September 1750.

Supporting paragraphs: Operation Overlord Battle of the Ch'ongch'on River
Answer: Operation Overlord