Arkansas in the American Civil War
By the end of 1861, the Union forces had secured Missouri by routing the Missouri militia that favored secession. In early 1862, the Union commander, General Samuel Curtis moved his Army of the Southwest into northwest Arkansas to take the fight to the Confedrates and secure Missouri from Rebel cross border incursions.
Newly appointed Confederate Army of the West commander, General Earl Van Dorn decided to take his numerically superior, but logistically inferior forces to the northwest of Arkansas and push the Union back onto the back foot in both Arkansas and Missouri.
After several skirmishes in February and early March, 1862, Curtis settled on favorable ground to the east of Pea Ridge, Arkansas. Van Dorn knew it was a good position, so decided to split his forces in an attempt to draw Curtis into a weaker position.