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The 4th Missouri Infantry Regiment was formed on April 28, 1862, and served in the Confederate States Army during the American Civil War. The infantry regiment did not see action at the Battle of Farmington on May 9, and the Battle of Iuka on September 19 despite being part of the Confederate force present at those battles. As part of Brigadier General Martin E. Green's brigade, the regiment participated in three charges against Union lines on October 3, 1862, during the Second Battle of Corinth. The following day, the regiment, along with the rest of Green's brigade, attacked the new Union lines. Despite initial success, the attack was repulsed by a Union counterattack. The regiment ceased to exist as a separate unit when it was combined with the 1st Missouri Infantry Regiment on November 7, 1862, to form the 1st and 4th Missouri Infantry Regiment (Consolidated). The combined unit served in the Vicksburg campaign in 1863, before surrendering at the end of the siege of Vicksburg. After undergoing a prisoner exchange, the men rejoined the Confederate Army and served in the Atlanta Campaign and the Battle of Franklin in 1864, still as part of the 1st and 4th Missouri Infantry Regiment (Consolidated). On May 9, 1865, near the end of the war, the consolidated regiment surrendered during the Battle of Fort Blakeley, ending the unit's existence. The 4th Missouri Infantry's battle flag is displayed at the American Civil War Museum.

The 4th Pennsylvania Infantry Regiment, officially known as the 4th Regiment, Pennsylvania Volunteer Infantry, was an infantry regiment of the Union Army in the American Civil War. Formed mostly from a militia unit in Norristown in southeastern Pennsylvania, the regiment enlisted at the beginning of the American Civil War in April 1861 for a three-month period of service under the command of Colonel John F. Hartranft. Logistical difficulties bedeviled the regiment, which served as part of the garrison of Washington, D.C., until late June, when it was sent into Northern Virginia to join in the army of Brigadier General Irvin McDowell. The regiment suffered its only combat casualties in a picket action on June 30 and was sent back to be mustered out on the eve of the First Battle of Bull Run owing to disagreement among the men over remaining with the army after the expiration of their term of service. Its men were denounced as cowards for being members of the only regiment to refuse to fight at the July 21 battle. Hartranft and a company commander remained with the army and later received the Medal of Honor for their actions at Bull Run. Many men of the regiment went on to serve in new Pennsylvania regiments, forming the bulk of the 51st Pennsylvania Infantry, which fought for the rest of the war.

The 55th (West Lancashire) Infantry Division was an infantry division of the British Army's Territorial Army (TA) that was formed in 1920 and existed through the Second World War, although it did not see combat. The division had originally been raised in 1908 as the West Lancashire Division, part of the British Army's Territorial Force (TF). It fought in the First World War, as the 55th (West Lancashire) Division, and demobilised following the fighting. In 1920, the 55th (West Lancashire) Division started to reform. It was stationed in the county of Lancashire throughout the 1920s and 1930s, and was under-funded and under-staffed. In the late 1930s, the division was reduced from three to two infantry brigades and gave up some artillery and other support units to become a motorised formation, the 55th (West Lancashire) Motor Division. This was part of a British Army doctrine change that was intended to increase battlefield mobility. Following the German occupation of Czechoslovakia, the division created new units around cadres of its own personnel, a process called "duplicating". The division then used these new formations to create its "duplicate", the 59th (Staffordshire) Motor Division. The 55th remained in the United Kingdom, in a defensive role, after the outbreak of the Second World War. In 1940, following the Battle of France, the motor division concept was abandoned. The division regained its third infantry brigade, and became the 55th (West Lancashire) Infantry Division. It remained within the United Kingdom, training for future operations as well as training replacements for combat units, and assigned to anti-invasion duties. By 1944, the division had been drained of many of its assets. The remnant of the division was used in Operation Fortitude, a deception effort that supported the Allied invasion of France. At the end of the war, the division was demobilised and not reformed.

The 59th (Staffordshire) Infantry Division was an infantry division of the British Army that was formed during the Second World War and fought in the Battle of Normandy. In March 1939, after Germany re-emerged as a significant military power and invaded Czechoslovakia, the British Army increased the number of divisions in the Territorial Army (TA) by duplicating existing units. The 59th (Staffordshire) Motor Division was formed in September 1939, as a second-line duplicate of the 55th (West Lancashire) Motor Division. The division's battalions were all, initially, raised in Staffordshire. Established using the motor division concept, the division was formed with only two infantry brigades, rather than the usual three for an infantry division, and was fully mobile. The intention was to increase battlefield mobility, enabling the motor divisions to follow armoured forces through breaches in the enemy frontline to rapidly consolidate captured territory. Following the Battle of France, the concept was abandoned. The division was allocated a third infantry brigade, and became the 59th (Staffordshire) Infantry Division. It remained within the United Kingdom until 1944, assigned to anti-invasion and guard duties, while training for combat overseas. In late June 1944, the division was assigned to the Second Army and transferred to France to take part in the Battle for Normandy. On 7 July, the division saw action in Operation Charnwood, which resulted in the capture of the German-occupied city of Caen. A week later, the division fought in Operation Pomegranate. The territorial goal of this operation was to capture the town of Noyers, which was not accomplished due to determined German resistance. The fighting played an important role in distracting German forces from the major British offensive, Operation Goodwood, which was launched soon after. By late July, the German frontline was crumbling, and a general offensive was launched. The division advanced and captured a bridgehead over the River Orne, fending off several counter-attacks to maintain its hold; during these actions one member of the division earned the Victoria Cross. The division's final combat was a protracted battle to capture the town of Thury-Harcourt. Historians have praised the effort of the division in these battles, during which it suffered several thousand casualties. By August 1944, the British Army was badly short of manpower in many of its units. As the division was the most recently established formation serving within the Second Army in France, and not as a result of its performance, it was chosen to be disbanded and its men transferred to other units to bring them up to strength. The division was broken up on 26 August, and officially disbanded on 19 October 1944.

The 6th Regiment Massachusetts Volunteer Militia was a peacetime infantry regiment that was activated for federal service in the Union army for three separate terms during the American Civil War (1861-1865). The regiment gained notoriety as the first unit in the Union Army to suffer fatal casualties in action during the Civil War in the Baltimore Riot and the first militia unit to arrive in Washington D.C., in response to President Abraham Lincoln's initial call for 75,000 troops. Private Luther C. Ladd of the 6th Massachusetts is often referred to as the first Union soldier killed in action during the war. In the years immediately preceding the war and during its first enlistment, the regiment consisted primarily of companies from Middlesex County. During its first term of service, four out of ten companies of the regiment were from Lowell, Massachusetts. Colonel Edward F. Jones commanded the regiment during its first term. He later commanded the 26th Massachusetts and was awarded the honorary grade of brevet brigadier general. During its second and third terms of service, the unit was commanded by Colonel Albert S. Follansbee. The regiment first enlisted for a "90-day" term of service which lasted from April 16 to August 2, 1861. Following their engagement in the Baltimore Riot, the 6th Massachusetts proceeded to Washington and then returned to Baltimore to guard locations within the city as well as the Baltimore and Ohio Railroad station at Elkridge, Maryland. Their second term of service lasted nine months from August 1862 to June 1863. During this time the 6th Massachusetts was attached to the VII Corps and participated in several expeditions and actions in the vicinity of Suffolk, Virginia, most notably the siege of Suffolk and the Battle of Carrsville in April and May 1863. Private Joseph S.G. Sweatt's bravery at Carrsville earned him the Medal of Honor. The 6th Massachusetts served a third term in response to the call for troops to defend fortifications around Washington. During this term, which lasted 100 days from July to October 1864, the 6th Massachusetts garrisoned Fort C. F. Smith in Arlington, Virginia and guarded Confederate prisoners of war at Fort Delaware near the mouth of the Delaware River.

The 766th Independent Infantry Regiment (Korean: 제766독립보병련대) was an elite light infantry unit of North Korea's Korean People's Army (KPA) that existed briefly during the Korean War. It was headquartered in Hoeryong, North Korea, and was also known as the 766th Unit (Korean: 766부대). Trained extensively in amphibious warfare and unconventional warfare, the 766th Regiment was considered a commando unit. The regiment was trained to conduct assaults by sea and then to lead other North Korean units on offensive operations, to infiltrate behind enemy lines, and to disrupt enemy supplies and communications. Activated in 1949, the regiment trained for more than a year before the outbreak of the war on June 25, 1950. On that day, half of the regiment led North Korean forces against South Korean troops by land and sea, pushing them back after several days of fighting. Over the next six weeks, the regiment advanced slowly down the Korean Peninsula, acting as a forward unit of the North Korean army. Suffering from a lack of supplies and mounting casualties, the regiment was committed to the Battle of Pusan Perimeter as part of a push to force United Nations (UN) troops out of Korea. The regiment saw its final action at the Battle of P'ohang-dong, fighting unsuccessfully to take the town from U.N. troops. Racked by U.N. naval and air forces and suffering extensive losses from continuous fighting, the regiment was forced to retreat from the P'ohang-dong battlefield. It moved north, joining a concentration of other KPA units, before being disbanded and absorbed into the KPA's 12th Division.

The 8th Missouri Infantry Regiment was an infantry regiment of the Confederate States Army during the American Civil War. From May 1861, the war began affecting events in the state of Missouri. In 1862, Confederate recruiting activities took place in Missouri, and a cavalry regiment was formed in Oregon County, the nucleus being former members of the Missouri State Guard. On September 2, the unit entered Confederate service, but it was reclassified as infantry ten days later. After many of the men transferred to other units, the regiment was reclassified as a battalion on October 19 and named the 7th Missouri Infantry Battalion, also known as Mitchell's Missouri Infantry. It participated in a Confederate offensive at the Battle of Prairie Grove on December 7. During the battle, the unit made several charges against the Union lines but was repeatedly repulsed by artillery fire. The regiment spent most of early 1863 encamped near Little Rock and Pine Bluff in Arkansas. On July 23, 1863, the unit was officially named the 8th Missouri Infantry Regiment. Later that year, it was part of the abortive Confederate defense of Little Rock before retiring to Camp Bragg near Camden. In March 1864, the regiment was sent south into Louisiana to help defend against the Red River campaign. It was part of a failed attack at the Battle of Pleasant Hill on April 9. After the Union troops involved in the Red River campaign retreated, the 8th Missouri Infantry was sent back to Arkansas, where it pursued the retreating Union soldiers led by Major General Frederick Steele. The regiment took part in a failed attack against Steele on April 30 at the Battle of Jenkins' Ferry. For the remainder of 1864 and the first half of 1865, the unit was stationed at several points in Louisiana and Arkansas. The Confederate Trans-Mississippi Department surrendered on June 2, 1865, and the men of the 8th Missouri Infantry Regiment were paroled on June 7, ending the regiment's military service.