 Complete the following phrase:  When he was nine years old, Lincoln was kicked in the head by a horse at the Noah Gordon Mill and was knocked unconscious for several hours. Other injuries or trauma throughout his life include having cut his hand with an axe at least once, incurred frostbite of his feet in 18301831, was struck by his wife apparently on multiple occasions, and was clubbed on the head during a robbery attempt in 1828. Lincoln 