Pea Ridge National Military Park is a 4,300 acre Civil War Battlefield that preserves the site of the March 1862 battle that saved Missouri for the Union. On the 7th and 8th of that month, nearly 26,000 soldiers fought to determine whether Missouri would remain under Union control, and whether or not Federal armies could continue their offensive south through the Mississippi River Valley. The park also includes a two and one half mile segment of the Trail of Tears. The Elkhorn Tavern, site of bitter fighting on both days, is a NPS reconstruction on the site of the original. The park is one of the most well preserved battlefields in the United States. Leashed pets are permitted in the park, but are not allowed in the buildings. Leashes must be no longer than six feet.