Read this excerpt from The Dark Game.Another thing that changed very little in the years between the wars was the means of obtaining military intelligence. Although the use of photography and the telegraph brought some technological advances, the craft of spying on the enemy's army still relied on fieldwork.
A
by enhancing the reader’s understanding of which technological advances were used during fieldworkB
by changing the reader’s perceptions about how fieldwork could help the Union causeC
by including more detailed information about who did fieldwork for the Union and how it was doneD
by adding complexity to the topic by raising the moral issues involved in fieldwork and other espionage