What is a example of Douglass' role in the Civil War?

The question is very vague.  From trying to examine the
group this is in and the nature of the question, I would say that perhaps you are
looking for how Frederick Douglass played a role in the Civil War.  Douglass' mere act
of living would have played a role in the Civil War, as his narrative reflects the
horrors of slavery and one that a nation predicated upon freedom and justice cannot
tolerate.  Adding to this would be Douglass' role as an abolitionist after the war.  His
lecturing, writing, and advocacy for the abolition of slavery plays a major role in the
Civil War as he creates a wave of public opposition to slavery, helping to further the
divide between North and South.  The question, from what I can see, is one in which we
are to assess Douglass' role in helping to galvanize action resulting in the Civil War. 
Certainly, Douglass was able to do that with his beliefs and passion about why slavery
is both a political and moral wrong.  This increases animosity towards and from the
South, helping to widen the growing divide.