The Armstrong gun is a type of artillery developed in the 19th century by British engineer Sir William Armstrong. It is known for its innovative design, featuring a rifled barrel that improved accuracy and range compared to smoothbore cannons. The gun was made of wrought iron, which made it lighter and easier to maneuver on the battlefield. Introduced in the 1850s, the Armstrong gun was used extensively during the Crimean War and other conflicts. Its ability to fire explosive shells marked a significant advancement in military technology, influencing the design of future artillery pieces and changing the nature of warfare.