“Your claim was that Grant and Sherman both owned slaves”
A claim is a parcel of land that you dig up gold on. :-)
The written recorded history of the Civil War verifies that Sherman and Grant as well as many other Northern officers and northerners including blacks owned slaves.
I know its hard to face I want to help you. I care about you. :-)
Then you should have no problem finding evidence of this fact.
I am not claiming that your statement is untrue, only that you provide evidence that it is.