of . The rifle was in service in the British Army until the 1840s. The Mexican Army, under Santa Anna, used British Baker Rifles during the 1836 Texas-Mexican War. Brunswick rifle The Brunswick rifle was a .704 calibre muzzle-loading percussion rifle manufactured for the British Army at the Royal Small Arms Factory at Enfield in the early 19th century. The weapon was introduced to replace the Baker rifle and weighed from over without its bayonet attached, depending on the pattern. The weapon was difficult to load but remained in production for about 50 years (1836 to 1885) and was used in both the United Kingdom and assorted colonies and outposts throughout the world. The Brunswick had a two-groove barrel designed to accept a "belted" round ball. There are four basic variants of the British Brunswick Rifle (produced in .654 and .704 calibre, both oval bore rifled and smoothbore). They are the Pattern 1836, the Pattern 1841, the Pattern 1848 and the Pattern 1840 Variant. Early Enfield rifles Throughout the evolution of the British rifle the name Enfield is prevalent; this refers to the Royal Small Arms Factory in the town (now suburb) of Enfield north of London, where the British Government produced various patterns of muskets from components manufactured elsewhere beginning in 1804. The first rifle produced in whole to a set pattern at Enfield was the Baker rifle. Brunswick rifles were also produced there, but, prior to 1851, rifles were considered speciality weapons and served alongside the muskets, which were issued to regular troops. Pattern 1851 In 1851, the Enfield factory embarked upon production of the Pattern 1851 Minié rifle using the conical Minie bullet, which replaced the Pattern 1842 .753 calibre smoothbore musket as the primary weapon issued to regular troops. The Pattern 1851 was referred to as a rifled musket and was longer than previous production rifles, conforming to the length of prior muskets, which allowed for consistency in standards for firing in ranks and bayonet combat. Relatively few of these were produced, since a new design was adopted within two years. The rifle used the lock and bayonet mount from the Pattern 1842, with a barrel. The new Minie ammunition allowed much faster loading, so that rifles were no longer slower to load than smoothbore muskets. Previous rifles, such as the Baker and the Brunswick, were designated for special troops, such as skirmishers or snipers, while