Twenty-six men, both officers and privates, who were members of Company D, Twelfth Regiment, from Benton county, saw their first active service at Fort Donelson, being recruited late in the summer of 1861, and it was one of the three Iowa regiments captured by the Confederates at Shiloh. The Twelfth and Fourteenth were in support of a battery, and having no orders to fall back were surrounded by the enemy. After several hours of desperate fighting, in which Colonel Woods of the Twelfth was seriously wounded, it was obliged to surrender. Sixteen of its men were killed, ninety-seven wounded and four hundred captured. Those of the Eighth, Twelfth and Fourteenth Iowa who were not made prisoners of war, were organized into the Union Brigade of which the Twelfth formed Companies E and K.
At the battle of Corinth, the Twelfth Iowa lost three killed and twenty-five wounded of the eighty men engaged, and in December, 1862, the Union Brigade was discontinued and the survivors of the Eighth, Twelfth and Fourteenth Iowa regiments, with those who had been parolled, assembled at Davenport, Iowa, and reorganized into their former commands. Subsequently the Eighteenth took part in the siege of Vicksburg, in the battle of Nashville and in the pursuit of Hood, as well as in the final expedition against Mobile and the heroic assault on Spanish Fort. During its entire service the Twelfth was in twenty-three battles; was under fire one hundred and twelve days, and had ninety-five men