Regular Army (United States) in the context of "General officers in the United States"

The United States Army (U.S. Army) is the land service branch of the United States Armed Forces. It is designated as the Army of the United States in the United States Constitution. It operates under the authority, direction, and control of the United States secretary of defense. As a part of the United States Department of Defense, it is one of the six armed forces of the United States and one of the eight uniformed services of the United States. The Army is the most senior branch in order of precedence amongst the armed services. It has its roots in the Continental Army, formed on 14 June 1775 to fight against the British for independence during the American Revolutionary War (1775–1783). After the Revolutionary War, the Congress of the Confederation created the United States Army on 3 June 1784 to replace the disbanded Continental Army.

The U.S. Army is part of the Department of the Army, which is one of the three military departments of the Department of Defense. The U.S. Army is headed by a civilian senior appointed civil servant, the secretary of the Army (SECARMY), and by a chief military officer, the chief of staff of the Army (CSA) who is a member of the Joint Chiefs of Staff. It is the largest military branch, and in the fiscal year 2022, the projected end strength for the Regular Army (USA) was 480,893 soldiers; the Army National Guard (ARNG) had 336,129 soldiers and the U.S. Army Reserve (USAR) had 188,703 soldiers; the combined-component strength of the U.S. Army was 1,005,725 soldiers. The Army's mission is "to fight and win our Nation's wars, by providing prompt, sustained land dominance, across the full range of military operations and the spectrum of conflict, in support of combatant commanders". The branch participates in conflicts worldwide and is the major ground-based offensive and defensive force of the United States of America.‌

During the American Civil War, the United States Army, the land force that fought to preserve the collective Union of the states, was often referred to as the Union Army, the Federal Army, or the Northern Army. It proved essential to the restoration and preservation of the United States as a working, viable republic.

The Union army was made up of the permanent regular army of the United States, but further fortified, augmented, and strengthened by the many temporary units of dedicated volunteers, as well as including those who were drafted in to service as conscripts. To this end, the Union army fought and ultimately triumphed over the efforts of the Confederate States Army.

A corps area was a geographically-based organizational structure (military district) of the United States Army used to accomplish administrative, training, and tactical tasks from 1920 to 1942. Each corps area included divisions of the Regular Army, Organized Reserve, and National Guard of the United States. Developed as a result of serious mobilization problems during World War I, this organization provided a framework to rapidly expand the Army in times of war or national emergency, such as the Great Depression.

The nine corps areas, created by the War Plans Division under authority of United States War Department General Order No. 50 on 20 August 1920, had identical responsibilities for providing peacetime administrative and logistical support to the army's mobile units as was provided by the six territorial "Departments" they replaced. In addition, the corps areas took on the responsibilities for post and installation support units ("Zone of the Interior" units) created during World War I. Corps areas had the added responsibility for planning and implementing mobilization plans for all Regular Army, National Guard, and Organized Reserve mobile units in their respective geographic areas; the development and administration of hundreds of new Organized Reserve and Reserve Officers Training Corps (ROTC) units; and managing the personnel records for thousands of Reserve officers, enlisted personnel, ROTC cadets, and Citizens Military Training Camp (CMTC) candidates.

United States Volunteers (also called U.S. Volunteers, U.S. Volunteer Army, among other variations) were military volunteers called upon during wartime to help the United States Army. They were separate from the Regular Army and the militia.

Until the Militia Act of 1903, the land forces of the United States were divided into three organizations:

The Army of the United States was one of the four major service components of the United States Army. Today, the Army consists of the Regular Army, the Army National Guard of the United States, the Army National Guard while in the service of the United States, and the United States Army Reserve. Previously however the Army of the United States was a component. However, the Army of the United States has been inactive since the suspension of the draft in 1973 and the U.S. military's transition to an all-volunteer force. Personnel serving in the United States Army during a major national emergency or armed conflict (either voluntarily or involuntarily) were enlisted or inducted into the Army of the United States without specifying service in a component. It also includes the "Retired Reserve". Those are retired soldiers who have reached the required years of creditable service, or creditable service and age; regardless of the component, or components they formerly served in.

The term "Army of the United States" or "Armies of the United States" is also the legal name of the collective land forces of the United States as prescribed by the United States Constitution. In this concept, the term "Army of the United States" has been in use since at least 1841 as in the title General Regulations for the Army of the United States. Also included by Act of the 39th Congress (1866) were the U.S. Volunteers, persons holding a brevetted rank, and the U.S. Veteran Reserve Corps.

The general officers of the Confederate States Army (CSA) were the senior military leaders of the Confederate States of America during the American Civil War of 1861–1865. They were often former officers from the United States Army (the regular army) before the Civil War, while others were given the rank based on merit or when necessity demanded. Most Confederate generals needed confirmation from the Confederate States Congress, much like prospective generals in the modern U.S. armed forces.

Like all of the Confederacy's military forces, these generals answered to their civilian leadership, in particular Jefferson Davis, the president of the Confederate States of America and therefore commander-in-chief of the military forces of the Confederate States.