Question: Which battle was fought for a shorter period of time, the Battle of the Ch'ongch'on River, or the Meuse-Argonne Offensive?

 It was fought from 26 September 1918 until the Armistice of 11 November 1918, a total of 47 days.  The Meuse-Argonne Offensive was the largest in United States military history, involving 1.2 million American soldiers.  It was one of a series of Allied attacks known as the Hundred Days Offensive, which brought the war to an end.  The battle cost 28,000 German lives and 26,277 American lives.  It was the largest and bloodiest operation of World War I for the American Expeditionary Force (AEF), which was commanded by General John J. Pershing, and one of the deadliest battles in American history. The Meuse-Argonne Offensive, also known as the Maas-Argonne Offensive and the Battle of the Argonne Forest, was a major part of the final Allied offensive of World War I that stretched along the entire Western Front.  American losses were exacerbated by the inexperience of many of the troops, and tactics used during the early phases of the operation. <SEP> The Third Battle of Seoul, also known as the Chinese New Year's Offensive, the January–Fourth Retreat (Korean: 1•4 후퇴 ) or the Third Phase Campaign Western Sector (), was a battle of the Korean War, which took place from December 31, 1950 to January 7, 1951 around the South Korean capital of Seoul.  In the aftermath of the major Chinese victory at the Battle of the Ch'ongch'on River, the United Nations Command started to contemplate the possibility of evacuation from the Korean Peninsula.  Upon learning of this development, China's Chairman Mao Zedong ordered the Chinese People's Volunteer Army to cross the 38th parallel in an effort to pressure the United Nations forces to withdraw from South Korea. <SEP>  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. 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.  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. <SEP> General Noël Marie Amédée Garnier-Duplessix (sometimes Duplessis) was a French army officer.  Whilst still a colonel he commanded the 2nd Infantry Division in the Allied victory at the First Battle of the Marne before seeing service in the Zaian War in the French protectorate of Morocco.  Garnier-Duplessix returned to France in October 1916 and received command of the 37th Infantry Division for the 15 December offensive of the Battle of Verdun and the Nivelle Offensive of April 1917.  He received command of the 9th Army Corps in June 1918 and led that unit to victory in the August Battle of Amiens and the autumn Meuse-Argonne Offensive.  After the war he was posted to Cilicia in the Franco-Turkish War of 1920-1 where he argued against early withdrawal of troops following the March 1921 Cilicia Peace Treaty.