John Thompson was an army leader. 
John Thompson was a leader in the army. 
John T. Thompson was a leader in the U.S. Army. 
Thompson spent much of his career in the Ordnance Department. This is the part of the Army that handles weapons. During the Spanish-American War, he was a colonel. He was the youngest colonel in the Army then. He also helped move 18,000 tons of supplies to Cuba.
Later, Thompson wanted to make a new kind of gun. He wanted a tool to help soldiers in trenches. He called this idea a "trench broom." He worked with John Blish on a new design. This design used a special way to slow down the parts.
Thompson retired from the Army twice to work on guns. He even worked for the Remington Arms Company. He was a brigadier general during World War I. He won the Distinguished Service Medal for his work. Thompson died in 1940 at age 79. He is buried at West Point.
John Taliaferro Thompson was a famous officer in the United States Army. 
Thompson worked hard to learn how weapons work. He joined the Ordnance Department in 1890 to study small arms. During the Spanish-American War, he was sent to Tampa, Florida. He served as the Chief Ordnance Officer for General William R. Shafter. Thompson was very good at moving supplies to the battlefield. He moved more than 18,000 tons of munitions without any accidents. He also became a colonel at a very young age. This war helped him see how automatic weapons could be used. He even helped set up a unit using Gatling guns.
After that war, Thompson became a leader in testing new tools. He supervised the making of the M1903 Springfield rifle. He also helped approve the M1911 pistol. To see how well the pistol worked, he used unusual tests. He used cattle and donated human cadavers to check the ammunition. These tests helped ensure the weapons were effective for soldiers. Later, he worked for the Remington Arms Company. He helped build a huge factory in Chester, Pennsylvania. This plant was the largest in the world for small arms.
During World War I, Thompson had a big idea for a new tool. He wanted a weapon to help soldiers in narrow trenches. He called his idea a "trench broom." 
Thompson's invention had a long life after he finished it. He first tried to make a powerful rifle. However, the .30-06 cartridge was too strong for his design. He decided to use .45 caliber ammunition instead. He patented the submachine gun in 1920. At first, many police agencies bought the weapon. By 1928, the company faced money problems and Thompson left. He died on June 21, 1940, at the age of 79. He is buried at the West Point Cemetery. Shortly after he died, the Army began using his guns again for World War II.
John Taliaferro Thompson was a prominent United States Army officer. He is most famous for inventing the Thompson submachine gun. This weapon is often called the "Tommy gun." Thompson was born on December 31, 1860, in Newport, Kentucky. He grew up moving between various Army posts. By age sixteen, he had decided to pursue a military career. He attended Indiana University before entering the United States Military Academy at West Point. He graduated from West Point in June 1882, ranking 11th in a class of 37 students.
Thompson spent most of his military career in the Army's Ordnance Department. He joined this department in 1890 to specialize in small arms. During the Spanish-American War, he served in Tampa, Florida. He acted as the Chief Ordnance Officer for General William R. Shafter. Thompson was highly efficient at managing munitions supplies for the Cuban campaign. He successfully transferred more than 18,000 tons of munitions without any accidents. Because of his success, he became a colonel at a very young age.
His work in the Ordnance Department involved supervising the development of many weapons. He oversaw the creation of the M1903 Springfield rifle. He also chaired the board that approved the M1911 pistol. To test the effectiveness of ammunition, Thompson conducted the Thompson-LaGarde cadaver tests. These unusual tests involved firing weapons at live cattle and donated human cadavers. 
World War I changed the way Thompson thought about weaponry. He saw a need for weapons that could clear enemy trenches. He called his concept a "trench broom." In 1914, he retired from the Army to work as Chief Engineer for the Remington Arms Company. During this time, he supervised the construction of the Eddystone Arsenal in Pennsylvania. At that time, it was the largest small arms plant in the world. The plant manufactured Pattern 1914 Enfield rifles for British forces and Mosin-Nagant rifles for Russia.
Thompson eventually returned to the Army during World War I. He was promoted to the rank of brigadier general. He served as the Director of Arsenals and supervised all small-arms production. For this service, he received the Army Distinguished Service Medal. While studying automatic designs, he partnered with a Navy commander named John Blish. They focused on a delayed-blowback breech system. This system was a way to manage the energy of the shot without using complex recoil or gas-operated parts.

Thompson originally tried to create an "autorifle" using the Blish principle. However, he found that the military's .30-06 cartridge was too powerful for the system. He decided to use .45 caliber ammunition instead. This was the same ammunition he had tested for the M1911 pistol. He formed the Auto-Ordnance Company to build his design. He patented the submachine gun in 1920. Although many civilian law enforcement agencies bought the weapon, sales were low by 1928. This led to a financial crisis, and Thompson was replaced as the head of the company.
Thompson's personal life included his wife, Juliet Estelle Hagans. Their son, Marcellus Hagans Thompson, graduated from West Point in 1906. Marcellus later joined his father in the automatic weapons business. John T. Thompson died on June 21, 1940, at the age of 79. He is buried at the United States Military Academy in West Point, New York. Shortly after his death, the United States prepared for World War II. This led the Army to order the Thompson submachine gun in large quantities. The weapon was used extensively in both its original and modified forms during that conflict.
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