Johnny loves his Uncle Silas, his mule Nell and the cows he herds back and forth each day. But he does not love being a slave. And when Uncle Silas plants the idea of service in the Union army in Johnny’s brain, it’s pretty easy for him to join up with Company C as it marches through the Hogatt farm. Adding to the Ready-to-Read early reading series, Hopkinson brings her research and storytelling talents to another little-known chapter in U.S. history for children. Floca’s simple, flat watercolors match the straightforward prose, and the blue-washed night scenes match the tension as Johnny performs an act of heroism to save the company. Though the acceptance the white soldiers show to their new recruit seems unreal, a helpful author’s note documents the kindness of these particular Union soldiers. Young Civil War buffs will welcome something they can read themselves. (Nonfiction. 5-8)