Although Humboldt was the more prominent military center in the area, along with other sites like Fort Belmont in Woodson County, at one time Iola’s “fort” had a force of 400 men and filled the area roughly demarcated by Madison, Jefferson, Broadway and South Streets. In the northeast corner of the block stood the Parsons building, which was essentially a Civil War military headquarters (1861-1865), and where many were sworn into service. The structure had initially been intended as a community safehouse in the event of attacks from hostile indigenous forces, but eventually concerns seem to have shifted from incursions by native people to pro-Southern militants.
Source: The Iola Register