Major-General Ulysses S. Grant to Major-General Henry W. Halleck, March 21, 1862 (Grant’s assessment of the situation around the Tennessee River)
https://civilwarnotebook.blogspot.com/2019/10/major-general-ulysses-s-grant-to-major.html
Colonel Thomas Kilby Smith to Elizabeth Budd Smith, March 21, 1862 (The 54th Ohio is at Pittsburg Landing
https://civilwarnotebook.blogspot.com/2014/03/colonel-thomas-kilby-smith-to-elizabeth_10.html
Diary of Lieutenant-Colonel Rutherford B. Hayes: Friday, March 21, 1862 (“He (McClellan) ought not to have allowed them to steal away from him, but if he now crushes them he redeems it all and becomes the Nation’s idol.”)
https://civilwarnotebook.blogspot.com/2016/03/diary-of-lieutenant-colonel-rutherford.html
Major Wilder Dwight: Monday, March 24, 1862 (“Jackson and Ashby are clever men. We are slow-w-w!”)
https://civilwarnotebook.blogspot.com/2016/07/major-wilder-dwight-monday-march-24-1862.html
Diary of Corporal David L. Day: March 21, 1862 (Day has a visit and a long, frank talk with a Newbern doctor.)
https://civilwarnotebook.blogspot.com/2020/09/diary-of-corporal-david-l-day-march-21.html
Diary of Private Daniel L. Ambrose: Friday, March 21, 1862 (“This morning, after having patiently waited their time, the Seventh is marched from the Fairchild and camped in the woods back from the landing.”)
https://civilwarnotebook.blogspot.com/2020/08/diary-of-private-daniel-l-ambrose_23.html
Major-General Thomas J. Jackson to Colonel Samuel Bassett French, March 21, 1862 (Jackson plans to give noncombatant jobs to conscientious objectors.)
https://civilwarnotebook.blogspot.com/2014/06/major-general-thomas-j-jackson-to_12.html
Diary of John Beauchamp Jones: March 21, 1862 (Not much chivalry shown by the secret police in Richmond.)
https://civilwarnotebook.blogspot.com/2015/10/diary-of-john-beauchamp-jones-march-21.html
Forgot to ping the list to these links to 8 items at Civil War Notebook.