Armoured warfare or tank warfare is the use of armoured fighting vehicles in modern warfare. It is a major component of modern methods of war. The premise of armoured warfare rests on the ability of troops to penetrate conventional defensive lines through use of manoeuvre by armoured units.

Much of the application of armoured warfare depends on the use of tanks and related vehicles used by other supporting arms such as infantry fighting vehicles and self-propelled artillery, as well as mounted combat engineers and other support units.

The doctrine of armoured warfare was developed to break the static nature of World War I trench warfare on the western front, and return to the 19th century school of thought that advocated manoeuvre and "decisive battle" outcomes in military strategy.

Prior to World War I, horse-mounted cavalry performed what is now the role of tanks; manoeuvring and breaking through enemy infantry to attack army lines of communication in the rear. The entry of machine guns on the battlefield, and the increased occupation of the flanks of armies, leading to closed fronts, made cavalry too vulnerable for this task.

Harsh Reality are a little-known, proto-prog band formed in Stevenage, Hertfordshire in 1968 out of the remnants of the Freightliner Blues Band (formerly the Revolution). The band consisted of Mark Griffiths and Dave Jenkins on guitars, Alan Greed on lead vocals and organ, Roger Swallow on drums, and Steve Miller on bass and backing vocals. They released a single for Philips Records in 1968 ("Tobacco Ash Sunday" / "How Do You Feel") before releasing their only album, Heaven and Hell, also on Philips in 1969. A final single followed soon after, before the band split in 1969.

Their Heaven and Hell LP is now a highly-sought rarity, selling for hundreds of pounds between eager collectors. For this reason, Harsh Reality is somewhat famous/infamous in collecting circles.

Though seen as part of the proto-progressive rock era, their work represented a marriage between the sounds of Procol Harum, Traffic and early Deep Purple.^{[citation needed]}

Following the band's demise, Roger Swallow played with Principal Edwards Magic Theatre, Matthews Southern Comfort, Plainsong, Albion Country Band, and Al Stewart; before moving to California and establishing himself as an electronic musician, songwriter and entrepreneur. Alan Greed went on to work with Ray Russell on the Rock Workshop albums, and as a session singer. Greed later fronted the jazz/progressive outfit, The Running Man. A self-titled album was released in the UK on the Neon record label in 1972.

Jag Panzer was an American power metal band from Colorado Springs, Colorado.

Jag Panzer came together in late 1981, being inspired by the onslaught of the New Wave of British Heavy Metal. The original line-up consisted of Harry Conklin on vocals (later nicknamed the "Tyrant"), Mark Briody (who was the sole guitarist of the group in its first incarnation), John Tetley who played the bass, and Rick Hilyard as the drummer. The band was known as Tyrant in its first incarnation. They soon had to change their name, because another such named band existed in California.

They saw a poster featuring a German World War II tank, named Jagdpanzer (literally "hunting tank" in German, but actually referring to what in English would be called a tank destroyer) which they decided to name their band after. They were however, unable to pronounce the name correctly and as a result, dropped the letter "D" from the name and simply called it Jag Panzer. The band, who were all in their late teens at the time, played at local venues in the Denver club circuit, and recorded an EP in 1983, later known as "Tyrants". In early 1984, the band recruited Joey Tafolla, a native of California, and promptly recorded their first album, Ample Destruction. The album was released in August of that year by the independent record label, Azra Records. The album was an underground hit in the United States, and in Europe and Japan it was available on import only.

World War I (WWI), which was predominantly called the World War or the Great War from its occurrence until 1939 (World War II), and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918. It involved all the world's great powers, which were assembled in two opposing alliances: the Allies (based on the Triple Entente of the United Kingdom, France and Russia) and the Central Powers (originally centred around the Triple Alliance of Germany, Austria-Hungary and Italy; but, as Austria–Hungary had taken the offensive against the agreement, Italy did not enter into the war). These alliances both reorganised (Italy fought for the Allies), and expanded as more nations entered the war. Ultimately more than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history. More than 9 million combatants were killed, largely because of enormous increases in lethality of weapons, thanks to new technology, without corresponding improvements in protection or mobility. It was the sixth-deadliest conflict in world history, subsequently paving the way for various political changes such as revolutions in the nations involved.