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.
Operation Diadem, also referred to as the Fourth Battle of Monte Cassino or, in Canada, the Battle of the Liri Valley, was an offensive operation undertaken by the Allies of World War II (U.S. Fifth Army and British Eighth Army in May 1944, as part of the Italian Campaign of World War II.
 "Diadem" was supported by air attacks called Operation Strangle.
 The opposing force was the German 10th Army.
The Battle of Kursk was a Second World War engagement between German and Soviet forces on the Eastern Front near Kursk (450 km south-west of Moscow) in the Soviet Union during July and August 1943.
 The battle began with the launch of the German offensive, Operation Citadel (German: "Unternehmen Zitadelle" ), on 5 July, which had the objective of pinching off the Kursk salient with attacks on the base of the salient from north and south simultaneously.
 After the German offensive stalled on the northern side of the salient, on 12 July the Soviets commenced their Kursk Strategic Offensive Operation with the launch of Operation Kutuzov (Russian: Кутузов ) against the rear of the German forces in the northern side.
 On the southern side, the Soviets also launched powerful counterattacks the same day, one of which led to a large armoured clash, the Battle of Prokhorovka.
 On 3 August, the Soviets began the second phase of the Kursk Strategic Offensive Operation with the launch of Operation Polkovodets Rumyantsev (Russian: Полководец Румянцев ) against the German forces in the southern side of the Kursk salient.
The "Zuihō" class (瑞鳳型 ) was a group of two aircraft carriers built for the Imperial Japanese Navy before World War II.
 Both ships were originally built as submarine tenders, but were subsequently converted into carriers.
 Completed in early 1942, "Shōhō" supported the invasion forces in Operation MO, the invasion of Port Moresby, New Guinea, and was sunk by American carrier aircraft on her first combat operation during the Battle of the Coral Sea on 7 May.
 "Shōhō" was the first Japanese aircraft carrier to be sunk during World War II.
 "Zuihō" played a secondary role in the Battle of Midway in mid-1942 and did not engage any American aircraft or ships during the battle.
 The ship participated in the Guadalcanal Campaign during the rest of 1942.
 She was lightly damaged during the Battle of the Santa Cruz Islands during this campaign and covered the evacuation of Japanese forces from the island in early 1943 after repairs.
The Battle of the Lys (7–29 April 1918) , also known as the Lys Offensive, the Fourth Battle of Ypres, the Fourth Battle of Flanders and Operation Georgette (Portuguese: "Batalha de La Lys" and French: "3ème Bataille des Flandres" ), was part of the 1918 German offensive in Flanders during World War I, also known as the Spring Offensive.
 It was originally planned by General Ludendorff as Operation George but was reduced to Operation Georgette, with the objective of capturing Ypres, forcing the British forces back to the channel ports and out of the war.
 In planning, execution and effects, Georgette was similar to (although smaller than) Operation Michael, earlier in the Spring Offensive.
USS "Antietam" (CV/CVA/CVS-36) was one of 24 "Essex"-class aircraft carrier s built during and shortly after World War II for the United States Navy.
 The ship was the second US Navy ship to bear the name, and was named for the American Civil War Battle of Antietam (Maryland).
 "Antietam" was commissioned in January 1945, too late to serve actively in World War II.
 After serving a short time in the Far East, she was decommissioned in 1949.
 She was soon recommissioned for Korean War service, and in that conflict earned two battle stars.
 In the early 1950s, she was redesignated an attack carrier (CVA) and then an antisubmarine warfare carrier (CVS).
 After the Korean War she spent the rest of her career operating in the Atlantic, Caribbean, and Mediterranean.
 From 1957 until her deactivation, she was the Navy's training carrier, operating out of Florida.
Operation Citadel (German: "Unternehmen Zitadelle" ) was a German offensive operation against Soviet forces in the Kursk salient during the Second World War on the Eastern Front that initiated the Battle of Kursk.
 The deliberate defensive operation that the Soviets implemented to repel the German offensive is referred to as the Kursk Strategic Defensive Operation.
 The German offensive was countered by two Soviet counter-offensives, Operation Polkovodets Rumyantsev (Russian: Полководец Румянцев ) and Operation Kutuzov (Russian: Кутузов ).
 For the Germans, the battle was the final strategic offensive that they were able to launch on the Eastern Front.
 As the Allied invasion of Sicily began Adolf Hitler was forced to divert troops training in France to meet the Allied threats in the Mediterranean, rather than use them as a strategic reserve for the Eastern Front.
 Germany's extensive loss of men and tanks ensured that the victorious Soviet Red Army enjoyed the strategic initiative for the remainder of the war.
Operation Cockade was a series of deception operations designed to alleviate German pressure on Allied operations in Sicily and on the Soviets on the Eastern Front by feinting various attacks into Western Europe during World War II.
 The Allies hoped to use Cockade to force the Luftwaffe into a massive air battle with the Royal Air Force and U.S. Eighth Air Force that would give the Allies air superiority over Western Europe.
 Cockade involved three deception operations: Operation Starkey, Operation Wadham, and Operation Tindall.
 Operation Starkey was set to occur in early September, followed by Operation Tindall in mid September, and lastly Operation Wadham in late September 1943.
The Battle of Antietam , also known as the Battle of Sharpsburg, particularly in the South, was fought on September 17, 1862, near Sharpsburg, Maryland and Antietam Creek as part of the Maryland Campaign.
 It was the first field army–level engagement in the Eastern Theater of the American Civil War to take place on Union soil and is the bloodiest single-day battle in American history, with a combined tally of 22,717 dead, wounded, or missing.
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.

Question: Were the Battle of Antietam and Operation Undertone both during World War I?
Answer: no