I have accepted both Fredericksburg and Chancellorsville as answers to question #16 - Fredericksburg because that was the answer my source supported and Chancellorsville because that was the answer supported by five sources cited by CindyScoops.
Here is the portion of her private message where she named her sources.
"I choose Chancellorsville, and support follows:
Echoes of Glory
http://www.gutenberg.org/files/1223...3-h/chap25.html (see chart)
http://www.army.mil/cmh-pg/reference/cwcmp.htm (US Army Center of Military History).
http://www.civilwarhome.com/Battles.htm (Shotgun's CW)
http://www.absoluteastronomy.com/en...ellorsville.htm"