Division (military) in the context of "1st Armored Division (United States)"

Armour (Commonwealth English) or armor (American English; see spelling differences) is a covering used to protect an object, individual, or vehicle from physical injury or damage, especially direct contact weapons or projectiles during combat, or from a potentially dangerous environment or activity (e.g. cycling, construction sites, etc.). Personal armour is used to protect soldiers and war animals. Vehicle armour is used on warships, armoured fighting vehicles, and some combat aircraft, mostly ground attack aircraft.

A second use of the term armour describes armoured forces, armoured weapons, and their role in combat. After the development of armoured warfare, tanks and mechanised infantry and their combat formations came to be referred to collectively as "armour".

The German Army (German: Heer, German: [heːɐ̯] ; lit. 'army') was the land forces component of the Wehrmacht, the regular armed forces of Nazi Germany, from 1935 until it effectively ceased to exist in 1945 and then was formally dissolved in August 1946. During World War II, a total of about 13.6 million volunteers and conscripts served in the German Army.

Only 17 months after Adolf Hitler announced the German rearmament programme in 1935, the army reached its projected goal of 36 divisions. During the autumn of 1937, two more corps were formed. In 1938 four additional corps were formed with the inclusion of the five divisions of the Austrian Army after the annexation of Austria by Germany in March. During the period of its expansion under Hitler, the German Army continued to develop concepts pioneered during World War I, combining ground and air units into combined arms forces. Coupled with operational and tactical methods such as encirclements and "battle of annihilation", the German military managed quick victories in the two initial years of World War II, a new style of warfare described as Blitzkrieg (lightning war) for its speed and destructive power.

The Waffen-SS (German: [ˈvafn̩ʔɛsˌʔɛs]; lit. 'Armed SS') was the combat branch of the Nazi Party's paramilitary Schutzstaffel (SS) organisation. Its formations included men from Nazi Germany, along with volunteers and conscripts from both German-occupied Europe and unoccupied lands. With the start of World War II, tactical control was exercised by the Oberkommando der Wehrmacht (OKW, "High Command of the Armed Forces"), with some units being subordinated to the Kommandostab Reichsführer-SS (lit. 'Command Staff Reich Leader-SS') directly under Reichsführer-SS Heinrich Himmler's control. It was disbanded in May 1945.

The Waffen-SS grew from three regiments to over 38 divisions during World War II. Combining combat and police functions, it served alongside the German Army (Heer), Ordnungspolizei (Order Police), and other security units. Originally, it was under the control of the SS Führungshauptamt (SS operational command office) beneath Himmler.

The Beiyang Army (Chinese: 北洋軍; pinyin: Běi Yáng Jūn; lit. 'Northern Ocean Army'), named after the Beiyang region, was an army established by Yuan Shikai in 1895. It was the centerpiece of a general overhaul of the Qing military system in the wake of the Boxer Rebellion and the First Sino-Japanese War, becoming the dynasty's first regular army in terms of its training, equipment, and structure. The Beiyang Army played a major role in Chinese politics for at least three decades and arguably right up to 1949. It played an instrumental role in the 1911 Revolution against the Qing dynasty, and, by dividing into warlord factions known as the Beiyang clique (Chinese: 北洋軍閥; pinyin: Běiyáng Jūnfá), ushered in a period of regional division.

The Beiyang Army had its origins in the Newly Created Army established in late 1895 under Yuan Shikai's command, after China was defeated in the First Sino-Japanese War. Unlike its predecessors, it had a formal structure with infantry, cavalry, artillery, and logistical branches, and maintained strict training and discipline. The brigade-sized force was expanded over the years with new recruits and by incorporating other units, before serving as the core of a larger army after Yuan was appointed the Viceroy of Zhili and Minister of Beiyang in 1901. The tensions in Manchuria leading up to the Russo-Japanese War caused Empress Dowager Cixi to accept Yuan's request to raise more divisions, and he also used his influential position in the Army Reorganization Bureau to prioritize its funding. By 1907 the Beiyang Army had 60,000 men organized in six divisions, some of whom served in the Inner City of Beijing as the emperor's palace guard, and on the eve of the 1911 Revolution it was the strongest military force of the Qing dynasty.

The Yugoslav Partisans, officially the National Liberation Army and Partisan Detachments of Yugoslavia (often shortened as the National Liberation Army) was the communist-led anti-fascist resistance to the Axis powers (chiefly Nazi Germany) in occupied Yugoslavia during World War II. Led by Josip Broz Tito, the Partisans are considered to be Europe's most effective anti-Axis resistance movement during World War II.

Primarily a guerrilla force at its inception, the Partisans developed into a large fighting force engaging in conventional warfare later in the war, numbering around 650,000 in late 1944 and organized in four field armies and 52 divisions. The main stated objectives of the Partisans were the liberation of Yugoslav lands from occupying forces and the establishment of a communist-ruled Yugoslav state.

Lieutenant general (Lt Gen, LTG and similar) is a military rank used in many countries. The rank traces its origins to the Middle Ages, where the title of lieutenant general was held by the second-in-command on the battlefield, who was normally subordinate to a captain general.

In modern armies, lieutenant general normally ranks immediately below general (or colonel general) and above major general; it is equivalent to the navy rank of vice admiral, and in air forces with a separate rank structure, it is equivalent to air marshal. In the United States, a lieutenant general has a three star insignia and commands an army corps, typically made up of three army divisions, and consisting of around 60,000 to 70,000 soldiers.

Field marshal (or field-marshal, abbreviated as FM) is the most senior military rank, senior to the general officer ranks.

Promotion to the rank of field marshal in many countries historically required extraordinary military achievement by a general (a wartime victory). However, the rank has also been used as a divisional command rank and as a brigade command rank.

Count Pyotr Alexandrovich Rumyantsev-Zadunaisky (Russian: Пётр Алекса́ндрович Румя́нцев-Задуна́йский; 15 January [O.S. 4 January] 1725 – 19 December [O.S. 8 December] 1796) was one of the foremost Russian military commanders of the 18th century, widely considered to be one of Russia's greatest military leaders and is referred to as one of the greatest commanders in military history. As a commander, he is placed on par with Alexander Suvorov. Rumyantsev used mobile divisional squares for the first time in history as opposed to linear battle orders and initiated the formation of light (jaeger) battalions in the Russian Army, which operated in a scattered order.

He governed Little Russia in the name of Empress Catherine the Great from the abolition of the Cossack Hetmanate in 1764 until Catherine's death 32 years later. Monuments to his victories include the Kagul Obelisk in Tsarskoye Selo (1772), the Rumyantsev Obelisk on Vasilievsky Island (1798–1801), and a galaxy of Derzhavin's odes.