A bitter rivalry between Cope and Marsh led to a vicious letter-writing campaign, similar to historical pamphlet wars. They used a range of tactics from espionage to theft to outshine each other, even resorting to ensuring their opponent was considered inferior. The upcoming episode will delve into specific examples of these tactics and explore how their conflict escalated to influencing matters in Washington, D.C. Additionally, insights into their personalities and personal lives will shed light on the origins of their animosity.