Frank's Campaign or, What Boys can do on the Farm for the Camp. by Horatio Alger - book 
1-4115-0000-8

PAPERBACK ILLUSTRATED While his father is serving in the Union Army during the Civil War, young Frank must work the family farm and find a way to pay off the mortgage. Aka: A Tale of the Farm and the Camp. In the Campaign Series.


Fifteen-year-old Frank Frost takes his father's place on their 50 acre farm, near Rossville, Pennsylvania, when his father left for service in the Civil War.
Frank's father’s letters reveal the perils of war afield, as his family deals with war’s effect on those left to make do.
Frank befriends Henry Morton, a visitor to Rossville, and arranges for him to board with his family—his $5 per week rent welcome because of the $800 mortgage the disreputable Squire Haynes held on the farm. Frank and Henry’s struggles with their overbearing landlord mirror Frank’s father’s battles with the oppressive forces of war.
The first and second editions of Frank's Campaign state in the preface: "The great struggle in which we are now engaged..." and the final paragraph of the book states, "I am obliged to leave my story incomplete. The Rebellion is not yet at an end."
Later editions, published after the war ended, have a completely different preface and the text states: "The war is happily over and Captain Frost has returned home with an honorable record of service."