Bill, if I remember correctly I was not responding to the idea that Newton and Thompson were laid next to one another after being wounded, but that they were wounded in close proximity to one another and fell close together. This, of course, was not the case, as their respective regiments were in different commands on different parts of the battlefield.
As far as the wounded Confederates were concerned, each division established temporary field hospitals in the rear, where many of the wounded were carried. Others were left in captured Union camps. Most of the wounded were soon evacuated to Corinth, Mississippi, and a few to Memphis. The most seriously wounded were left in various locations around the battlefield, where their care was soon taken up by the Union army. The killed were interred in mass graves in shallow trenches, as were many of the wounded who died shortly after the battle. Thompson was buried on the field in an individual grave, from which he was disinterred after the war and reinterred at Richmond, Virginia.
If Mrs. Ross claimed that Newton and Thompson were carried to the same field hospital after the fighting, that's certainly in the realm of possibility.