Joel Parker, Harvard Professor of Law: "Do not perceive that Lincoln is not only an absolute monarch, but that this is an absolute uncontrollable government, a perfect military despotism?" 

The Geneva Convention first came out in 1863 and the Lincoln Administration was one of the original signatories. They were also the biggest hypocrites ever in signing, tantamount to the Taliban signing on for women's rights. 

Using the rules established by the Allies after the Second World War, Lincoln and the high command of the Union Army unquestionably qualified as war criminals.