The 22nd Battalion, also known as the "Wellington Battalion", was an infantry battalion of the New Zealand Military Forces, which served during the Second World War. After undertaking defensive duties in the United Kingdom from mid-1940 until early 1941, the battalion then fought in the Battles of Greece and Crete where it suffered heavy casualties and lost a large number of men who were taken as prisoners of war. After being rebuilt, the battalion fought in North Africa, fighting in Operation Crusader, before undertaking garrison duties in Syria. It later fought in the First Battle of El Alamein during which they suffered heavy casualties at Ruweisat Ridge. Re-formed, the battalion later fought in the Second Battle of El Alamein. In late 1943, the battalion was transferred to Italy where it fought for the remainder of the war, fighting battles around Cassino and along the Adriatic coast, before entering Trieste in the final days of the war. After the war, it performed occupation duties in Japan until it was disbanded in 1948.

The Battle of Crete, codenamed Operation Mercury, was a major Axis airborne and amphibious operation during World War II to capture the island of Crete. It began on the morning of 20 May 1941, with multiple German airborne landings on Crete. Greek and other Allied forces, along with Cretan civilians, defended the island. After only one day of fighting, the Germans had suffered heavy casualties and the Allied troops were confident that they would defeat the invasion. The next day, through communication failures, Allied tactical hesitation, and German offensive operations, Maleme Airfield in western Crete fell, enabling the Germans to land reinforcements and overwhelm the defensive positions on the north of the island. Allied forces withdrew to the south coast. More than half were evacuated by the British Royal Navy and the remainder surrendered or joined the Cretan resistance. The defence of Crete evolved into a costly naval engagement; by the end of the campaign the Royal Navy's eastern Mediterranean strength had been reduced to only two battleships and three cruisers.