There are about 110 Sedgwicks in my Civil War database.
All of them will be featured here in time; here's a start.

Sedgwicks of the Colored Infantry Units

A pre-war speech delivered in Congress by Charles Baldwin Sedgwick

  General John Sedgwick (1813 - 1864)
  Killed by a sniper at Spottsylvania, Virginia
  Genealogy and photos of the famous Civil War General
  William Dwight Sedgwick - B4A4 (1831 - 1862)
  Wounded at Antietam, September 17, 1862
  died ten or twelve days later, Sept 27 or 29.
  Irving M Sedgwick - 418252 (1841 - 1916)
  Congressional Medal of Honor
  Provost Guard at Gettysburg
  wounded at Spottsylvania
  one of Lincoln's honor guard on funeral train
  Varney A Sedgwick
  Missouri 24 Infantry
  died of disease at Saint Louis
  buried Jefferson Barracks National Cemetery
  Sergeant George Fletcher Sedwick
  Company K, Sixth United States Cavalry
  His horse fell on him in the swamp, trapping him overnight;
  he contracted a disease and died several days later.
  Manuscript by Stephen R Schall
  Captain Daniel Wesley Sedwick
  Company E, Illinois 102 Volunteer Infantry
  later brevetted Major by President Lincoln
  with General Sherman on his "March to the Sea"
Thomas M Sedwick
Pvt PA 139 INF, at Gettysburg Corps 6 Division 3 Brigade 3
later captured, died a POW at Andersonville Prison, Georgia