Infographic: Casualties and Costs of the Civil War by Gilder Lehrman Institute Staff View this infographic as a PDF. Questions for Discussion Why did troop strength peak in 1863? Do you think that the differences in troop strength were responsible for the war's outcome? How does the cost of the Civil War--in casualties and expense--compare to the cost of other American wars? Why do you think that the Civil War was so lethal?