I'll address the same question in my reply 72 to you as well.
The Geneva Convention of 1863 condemned the bombardment of cities occupied by civilians, but Lincoln ignored all such restrictions on his behavior.
The First Geneva Convention of 1864, not 1863, dealt solely with treatment of sick and wounded in the war. And it wasn't signed by the U.S. until 1882 anyway. Link
The source of the preceding quotes is The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies (128 volumes published by the Government Printing Office). Thomas Bland Keys compiled some of the most shocking comments in his excellent 1991 book, Uncivil War: Union Army and Navy Excesses in the Official Records, published by the Beauvoir Press in Biloxi, Mississippi.
Did he include this one?
"I myself have seen in Missouri, Kentucky, Tennessee, and Mississippi, hundreds and thousands of women and children fleeing from your armies and desperadoes, hungry and with bleeding feet. In Memphis, Vicksburg, and Mississippi, we fed thousands upon thousands of the families of rebel soldiers left on our hands, and whom we could not see starve. Now that war comes home to you, you feel very different. You deprecate its horrors, but did not feel them when you sent car-loads of soldiers and ammunition, and molded shells and shot, to carry war into Kentucky and Tennessee, to desolate the homes of hundreds and thousands of good people who only asked to live in peace at their old homes and under the Government of their inheritance. But these comparisons are idle. I want peace, and believe it can only be reached through union and war, and I will ever conduct war with a view to perfect and early success."
Or this one?
"War is the remedy our enemy's have chosen. They dared us to war, and you remember how tauntingly they defied us to the contest. We have accepted the issue and it must be fought out. You might as well reason with a thunderstorm. I say let us give them all they want; not a word of argument, not a sign of let up, no cave in till we are whipped or they are."
Sherman was evil and heartless. He should have been hung for war crimes.