Subsequently he re-enlisted in Company L, Fourth Iowa Cavalry & was mustered out as captain, Company F, Seventh Iowa Volunteer Cavalry in June 1866.In his book, "The Lyon Campaign In Missouri In 1861, Being A History Of The First Iowa Infantry," Ware gives the history of the First Iowa Infantry, a three month regiment raised at the call of President Lincoln to put down the rebellion. Missouri a border slave state, which controlled important points on the Mississippi River like St Louis with its large arsenal, was divided in its sympathy between North & South.Quick action by General Nathaniel Lyon kept its pro-South government from seizing Missouri's important cities, but the new Confederate States government then sent troops under Generals McCullough & Price to assist pro-slavery local Missouri forces. General Lyon mounted the campaign described in Ware's book, which culminated with the battle at Wilson Creek to try & stop the Confederates.General Lyon was killed in the battle & the Confederate forces held the field, but were so weakened & disorganized that they were unable to follow up the victory. This allowed Union forces to keep most of this important border state under their military control for the entire Civil War.