Final answer:
Sagan meant that the behavior of the surviving veterans at the 50th anniversary of the Battle of Gettysburg was more significant than any military victory.
Step-by-step explanation:
In 1913, Carl Sagan referred to the behavior of the surviving veterans who attended the 50th anniversary of the Battle of Gettysburg as the real triumph of the event. He meant that their behavior, which showed courage and endurance, was more meaningful and significant than any military victory.