Link.
If however, as you suggest, they were good, moral and righteous weapons, what's the big deal with Sherman giving the prisoners the opportunity to clean them up?
Likewise, as long as we're talking about Sherman's "barbarity" why not take a look at his correspondence with Hood prior to his taking of Atlanta? Sherman requested Hood vacate the city, and offered to assist in the relocation of it's citizens. Hood placed his defensive positions in and amongst the city's residences, churches etc., then accused Sherman of firing upon residences, churches, etc. It was perhaps history's first "made for al-jazeera" production.
There is -0- proof that the world considered the use of mines to be against the rules of war. The only thing your link proves is that the UNION considered them so (because they were WORKING!) and they committed war crimes to try and eradicate the threat. Sounds like the Yankees had a case of “sour grapes”.......
Too bad the Confederacy did’t have use of the weapons sooner......