Operation Undertone was a large assault by the U.S. Seventh and French 1st Armies of the U.S. Sixth Army Group as part of the Allied invasion of Germany in March 1945 during World War II.
The Battle of Norfolk was a tank battle fought on February 27, 1991, during the Persian Gulf War, between armored forces of the United States and United Kingdom, and those of the Ba'athist Iraqi Republican Guard.
 The primary participants were the U.S. 2nd Armored Division (Forward),1st Infantry Division (Mechanized), and the Iraqi 18th Mechanized and 9th Armoured Brigades of the Republican Guard Tawakalna Mechanized Infantry Division along with elements from eleven other Iraqi divisions.
 The 2nd Armored Division(Fwd) was assigned to the American 1st Infantry Division as its 3rd maneuver brigade due to the fact that one of its brigades was not deployed.
 The British 1st Armoured division was responsible for protecting the right flank of VII Corps.
 Its main adversary being the Iraqi 52nd Armored Division and multiple infantry divisions.
 It was the final battle of the war before the unilateral ceasefire took effect.
 Two more battles occurred at Objective Dorset and near the oil field at Rumaila after the ceasefire.
 The Battle of Norfolk has been recognized by some sources as the second largest tank battle in American history and the largest tank battle of the 1st Gulf War.
 No fewer than 12 divisions participated in the Battle of Norfolk along with multiple brigades and elements of a regiment.
 American and British forces destroyed approximately 750 Iraqi tanks and hundreds of other types of combat vehicles.
 This goes without even taking into consideration the destruction of two additional Republican Guard divisions at Objective Dorset by the 3rd Armored Division on 28 February 1991.
 During this action the 3rd Armored Division destroyed 250 enemy vehicles and captured 2,500 Iraqi soldiers.
 Over a decade passed after the conflict before quality references became available on most of the battles that took place during the 1st Gulf War.
 Many of the land battles during Operation Desert Storm were larger than the majority of the battles that took place in southern and western Europe during World War Two, at least as far as the quantity of equipment involved.
The Battle of Kuwait International Airport occurred on February 27, 1991 during the 1st Gulf War.
 It was a tank battle between the United States and Ba'athist Iraq.
 Despite being a very large battle it is often overlooked compared to the other battles which took place during the war.
 No less than elements of 18 divisions total participated in this battle.
 U.S. Army Special Forces units and multiple Iraqi Commando units were also in theatre.
 In reality the battle took place over a span of three days despite the primary battle at Kuwait International Airport lasting only one day.
 Much of the combat actually took place en route to the airport.
 The battle featured the "Reveille Engagement" which went on to become the biggest and fastest tank battle in United States Marine Corps' entire history.
Operation "Veritable" (also known as the Battle of the Reichswald) was the northern part of an Allied pincer movement that took place between 8 February and 11 March 1945 during the final stages of the Second World War.
 The operation was conducted by Field Marshal Bernard Montgomery's Anglo-Canadian 21st Army Group, primarily consisting of the First Canadian Army under Lieutenant-General Harry Crerar and the British XXX Corps under Lieutenant-General Brian Horrocks.
 The U.S. Ninth Army was incorporated into the 21st Army Group.
 The objective of the operation was to clear German forces from the area between the Rhine and Maas rivers, east of the German/Dutch frontier, in the Rhineland.
 It was part of General Dwight D. Eisenhower's "broad front" strategy to occupy the entire west bank of the Rhine before its crossing.
 "Veritable" (originally called "Valediction") had been planned for execution in early January, 1945 when the ground had been frozen and thus more advantageous to the Allies.
 The Allied expectation was that the northern end of the Siegfried Line was less well defended than elsewhere and an outflanking movement around the line was possible and would allow an early assault against the industrial Ruhr region.
The Battle of Baguio occurred between 21 February and 26 April 1945, and was part of the greater Luzon campaign during the Allied liberation of the Philippines at the end of World War II.
 During the battle, American and Philippine forces recaptured the city of Baguio on the island of Luzon from a Japanese occupation force.
 One of the last tank engagements of the Philippine campaign took place during the battle.
 Baguio later became the scene of the final surrender of Japanese forces in the Philippines in September 1945.
The Battle of Luzon, fought 9 January – 15 August 1945, was a land battle of the Pacific Theater of Operations of World War II by the Allied forces of the U.S., its colony the Philippines, and allies against forces of the Empire of Japan.
 The battle resulted in a U.S. and Filipino victory.
 The Allies had taken control of all strategically and economically important locations of Luzon by March 1945, although pockets of Japanese resistance held out in the mountains until the unconditional surrender of Japan.
 While not the highest in U.S. casualties, it is the highest net casualty battle U.S. forces fought in World War II, with 192,000 to 205,000 Japanese combatants dead (mostly from starvation and disease), 10,000 American combatants killed, and between 120,000 to 140,000 Filipino civilians and combatants killed.
The Battle of Clitheroe was a battle between a force of Scots and English knights and men at arms which took place on 10 June 1138 during the period of The Anarchy.
 The battle was fought on the southern edge of the Bowland Fells, at Clitheroe, Lancashire.
 It took place in the course of an invasion of England by King David I of Scotland.
 In the summer of 1138, King David split his army into two forces.
 One of them, commanded by William fitz Duncan, Mormaer of Moray, marched into Lancashire.
 There he harried Furness and Craven.
 On 10 June, William fitz Duncan was met by a force of knights and men-at-arms.
 A pitched battle took place and the result was that the English army was routed.
 The battle was a prelude to the Battle of the Standard later in the summer, where the result was reversed.
Back to Bataan is a 1945 World War II war film directed by Edward Dmytryk and starring John Wayne and Anthony Quinn.
 It depicts events (some fictionalized and some actual) that took place after the Battle of Bataan (1941–42) on the island of Luzon in the Philippines.
 The working title of the film was "The Invisible Army".
Operation Anaconda took place in early March 2002.
 CIA Paramilitary Officers, working with their allies, attempted to destroy al-Qaeda and Taliban forces.
 The operation took place in the Shahi-Kot Valley and Arma Mountains southeast of Zormat.
 This operation was the first large-scale battle in the United States War in Afghanistan since the Battle of Tora Bora in December 2001.
 This was the first operation in the Afghanistan theater to involve a large number of U.S. conventional (i.e. non-Special Operations Forces) forces participating in direct combat activities.
Kiyoshi Ogawa (Japanese: 小川 清 "Ogawa Kiyoshi", October 23, 1922 – May 11, 1945) was a Japanese naval aviator ensign (少尉 ) of the Imperial Japanese Navy during World War II.
 As a kamikaze pilot, Ensign Ogawa's final action took place on May 11, 1945, during the Battle of Okinawa.
 Piloting a bomb-laden Mitsubishi Zero fighter during Operation Kikusui No. 6, Ogawa at the age of 22 flew through American anti-aircraft fire and attacked the U.S. Navy aircraft carrier USS "Bunker Hill" .
 He dropped a 550 lb bomb, never pulled out of the dive, and crashed deliberately into the flight deck near the control tower of the American aircraft carrier.
 The bomb penetrated "Bunker Hill's" flight deck and exploded, gasoline fires flamed up and several explosions took place when re-armed and re-fueled planes on deck exploded and caught fire.
 Nearly 400 American sailors died with Ogawa and the ship was disabled for the remainder of the war.

Question: Which took place longer in 1945, Battle of Luzon or Operation Undertone?
Answer: Battle of Luzon