World War II, or the Second World War, was a global military conflict. It began as the joining of what had initially been two separate conflicts, with the first beginning in Asia in 1937 (the Second Sino-Japanese War) and the other beginning in Europe in 1939 (the German and Soviet invasion of Poland).
The war split the majority of the world's nations into two opposing military alliances: the Allies and the Axis. It involved the mobilization of over 100 million military personnel, making it the most widespread war in history, and placed the participants in a state of "total war", which erased the distinction between civil and military resources and resulted in the complete activation of a nation's economic, industrial, and scientific capabilities for the purposes of the war effort. Over 70 million people, the majority of them civilians, were killed, making it the deadliest conflict in human history.
The Enigma machine was a ciphermachine used to encrypt and decrypt secret messages. More precisely, Enigma was a family of related electro-mechanical rotor machines, comprising a variety of different models.The Enigma was used commercially from the early 1920s on, and was also adopted by the military and governmental services of a number of nations—most famously by Nazi Germany before and during World War II.The German military model, the Wehrmacht Enigma, is the version most commonly discussed.The machine has gained notoriety because Alliedcryptologists were able to decrypt a large number of messages that had been enciphered on the machine. Decryption was made possible in 1932 by Polish cryptographers Marian Rejewski, Jerzy Różycki and Henryk Zygalski from Cipher Bureau. In mid-1939 reconstruction and decryption methods were delivered from Poland to Britain and France. The intelligence gained through this source, codenamed ULTRA, was a significant aid to the Allied war effort.
The Battle of Tulagi and Gavutu–Tanambogo was a land battle of the Pacific campaign of World War II, between Imperial Japanese Navy and Allied (mainly United States (U.S.) Marine) ground forces. It took place August 7 – August 9, 1942, on the Solomon Islands, during the initial Allied landings in the Guadalcanal campaign.In the battle, U.S. Marines, under the overall command of U.S. Major GeneralAlexander Vandegrift, successfully landed and captured the islands of Tulagi, Gavutu, and Tanambogo among which the Japanese Navy had constructed a naval and seaplane base. The landings were fiercely resisted by the Japanese Navy troops who, outnumbered and outgunned by the Allied forces, fought and died almost to the last man.At the same time that the landings on Tulagi and Gavutu–Tanambogo were taking place, Allied troops were also landing on nearby Guadalcanal, with the objective of capturing an airfield under construction by Japanese forces. In contrast to the intense fighting on Tulagi and Gavutu, the landings on Guadalcanal were essentially unopposed. The landings on both Tulagi and Guadalcanal initiated the six-month long Guadalcanal campaign and a series of combined-arms battles between Allied and Japanese forces in the Solomon Islands area.
The forward magazine of the destroyerUSS Shaw explodes as a result of combat damage during the attack on Pearl Harbor, December 7, 1941. At right, the bow of USS Nevada can be seen after her aborted escape attempt out channel. Many people mistakenly believe the ship shown exploding is USS Arizona, whose destruction during the attack accounted for over half of the men killed in action.
Air MarshalSir George JonesKBE, CB, DFC (18 October 1896 – 24 August 1992) was a senior commander in the Royal Australian Air Force (RAAF). He rose from being a private soldier in World War I to Air Marshal in 1948. He served as Chief of the Air Staff from 1942 to 1952, the longest continuous tenure of any RAAF chief. Jones was a surprise appointee to the Air Force’s top role, and his achievements in the position were coloured by a divisive relationship during World War II with his head of operations and nominal subordinate, Air Vice MarshalWilliam Bostock.Jones first saw action as an infantryman in the Gallipoli campaign of 1915, before transferring to the Australian Flying Corps the following year. Initially an air mechanic, he undertook flying training in 1917 and was posted to a fighter squadron in France, achieving seven victories to become an ace. After a short spell in civilian life following World War I, he joined the newly-formed RAAF in 1921, rising steadily through training and personnel commands prior to World War II.