Question: In which world war did Operation Grenade and Gothic Line occurred?

Context paragraphs:
Hawkins grenade: The Grenade, Hand, Anti-tank, No. 75, also known as the Hawkins grenade was a British anti-tank hand grenade used during World War II.  It was one of a number of grenades developed for use by the British Army and Home Guard in the aftermath of the Dunkirk evacuation.  The grenade first appeared in 1942, and was designed to be more versatile than previous grenades, such as the Grenade, Hand, Anti-tank No. 73 and the Grenade, Hand, Anti-Tank, No. 74.

Sticky bomb: The Grenade, Hand, Anti-Tank No. 74, commonly known as the S.T. Grenade or sticky bomb, was a British hand grenade designed and produced during the Second World War.  The grenade was one of a number of anti-tank weapons developed for use by the British Army and Home Guard as an "ad hoc" solution to a lack of sufficient anti-tank guns in the aftermath of the Dunkirk evacuation.  Designed by a team from MIR(c) including Major Millis Jefferis and Stuart Macrae, the grenade consisted of a glass sphere containing an explosive made of nitroglycerin and additives (this added stability to the mix, as well as giving it its squash-head-like effect) covered in a strong adhesive and surrounded by a sheet-metal casing.  When the user pulled a pin on the handle of the grenade, the casing would fall away and expose the sticky sphere.  Pulling another pin would arm the firing mechanism and the user would then attempt to attach the grenade to an enemy tank or other vehicle.  Letting go of the handle would release a lever that would activate a five-second fuse, which would then detonate the nitroglycerin.

Battle of Gemmano: The Battle of Gemmano was fought between the German and Allied forces in World War II.  It was part of the Allies' Operation Olive, the offensive in August 1944 on the Gothic Line, the German line of defence in the Apennines in northern Italy.  It consisted of a series of four British attacks between 4 September to 15 September 1944, on the German defences in and around the village of Gemmano.  The village itself was taken on 9 September during the second attack, two more actions being required to take the surrounding area.  Fighting was heavy, and the Battle of Gemmano has been called the "Cassino of the Adriatic" by some historians.

M7 grenade launcher: The M7 grenade launcher, formally rifle grenade launcher, M7, was a 22 mm rifle grenade launcher attachment for the M1 Garand rifle that saw widespread use throughout World War II and the Korean War.  The M7 was a tube-shaped device, with one end slotting over the barrel of the rifle, the other end holding the grenade in place.  Blank cartridges were loaded into the rifle prior to firing.  When fired, the expanding gases generated by the cartridges propelled the grenade forward with considerable force.  The M7 could fire grenades up to 350 m , compared with the maximum of 30 m achieved by hand grenades.

M34 grenade: The M34 White Phosphorus Smoke Grenade or "Willie Pete" was a chemical grenade manufactured by Rocky Mountain Arsenal from the late 1950s and used by U.S. forces during the Vietnam War and was also used during the First Gulf War.  The M34 WP Grenade replaced the World War II M15 WP grenade.  The M34 could be fired from a rifle grenade launcher using M2-series grenade launching adapters, which the groove around the tapered base allowing the adapter arms to grasp it.  The M15 could not be fired as a rifle grenade.  The M34 had a segmented body to allow for a better hand grip and to identify it as a casualty-producing grenade, even though it did not fragment.  The smooth-bodied M15 was sometimes assumed to be a burning type smoke grenade as the AN-M8 white smoke and resulted in injuries.

Battle of Rimini (1944): The Battle of Rimini took place between 13 and 21 September 1944 during Operation "Olive", the main Allied offensive on the Gothic Line in August and September 1944, part of the Italian Campaign in the Second World War.  Rimini, a town on the Adriatic coast of Italy, anchored the Rimini Line, a German defensive line which was the third such line forming the Gothic Line defences.

Gothic Line order of battle: Gothic Line order of battle is a listing of the significant formations that were involved in Operation "Olive", the Allied offensive on the Gothic Line in northern Italy, August–September 1944, and in the subsequent fighting in the central Apennine mountains and on the plains of eastern Emilia–Romagna up to April 1945.

Operation Grenade: During World War II, Operation Grenade was the crossing of the Roer (Rur) river between Roermond and Düren by the U.S. Ninth Army, commanded by Lieutenant General William Hood Simpson, in February 1945.

Gothic Line: The Gothic Line (German: "Gotenstellung" ; Italian: "Linea Gotica" ) was a German defensive line of the Italian Campaign of World War II.  It formed Field Marshal Albert Kesselring's last major line of defence along the summits of the northern part of the Apennine Mountains during the fighting retreat of the German forces in Italy against the Allied Armies in Italy, commanded by General Sir Harold Alexander.

Offensive grenade wz. 24: The Granat zaczepny wz.24 (Polish for "Offensive grenade, Mark 1924") was a concussion grenade used by the Polish Army before and during World War II.  The oval egg-shaped shell casing was made of thin sheet metal filled with picric acid or TNT.  Initially used with a variety of fuses, since early 1930s the grenade was used with the standard Zapalnik wz.  Gr.  31 time fuse designed for the Defensive grenade wz.33.  The grenade armed with the wz.  Gr.  31 fuse is sometimes referred to as wz.  24/31 to distinguish it from the original wz.24 grenade armed with different fuses.

Supporting paragraphs: Operation Grenade Gothic Line
Answer: World War II