Do we have any idea what the common sentiment among Union Civil War veterans was, in regards to Confederate memorabilia and memorials?

by Ptolemy226

Many Civil War veterans lived into the 20th century and were alive to witness the construction of the Confederate monuments that cause so much controversy today. Do we have any articles, diaries, etc. revealing to us what these Veterans of the war felt about said monuments and the revival of the Virginian army flag?

Georgy_K_Zhukov