1st Army of the West explained

1st Army of the West may refer to:

• First Western Army, created in 1810 as part of the reorganisation of the Imperial Russian Army, was intended as a defense against the north-western part of the Empire from the expected invasion by Napoleon
• First Army Division West is a division of the First United States Army activated in 2007

See also

• First Army (disambiguation)
• Army of the Tennessee, a Union army in the Western Theater of the American Civil War, sometimes described as the "Army of West Tennessee"
• Polish Armed Forces in the West, formed to fight alongside the Western Allies against Nazi Germany and its allies during WWII