During the Civil War, intelligence was gathered in the same ways it had been gathered in previous wars. Thus, option "A" is correct.
<h3>What is the central idea of The Dark Game?</h3>
Paul Janeczko's "The Dark Game" delves into the spy world of the United States and how it played a huge part in military actions in the past. This book provides true stories or narrations about how military and national administrations used various sources to obtain information, including the use of spies and cyber espionage, surveillance satellites, etc.
In the given excerpt, the author's main purpose or aim is to inform the readers of how information used to be gathered by the government in the past. The use of military intelligence, before and during the Civil War, remains the same or only changed a bit. Despite the new technological advancement with photography and telegraph, obtaining information was still largely done using the same means- "fieldwork".
Thus, the best summary for the given paragraph will be that information/ intelligence was gathered using the same methods that were used in the previous years.
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