Now I`m probably doing something wrong here, but these results seem strange.
In two different Games I`ve tried to take Nashville with my heavy hitters Grant & Sherman in 1862.
In one I tried having both command divisions of about 8000 men each with at least 2 Batterys in each, starting out from just across the river in Gatlien, which I built a supply depot in. In the other game Grant was the Corps Commander and Sherman had the division with about 13,000 men and 3 batterys. In both Games Joe Johnston gives battle, the Union is declared Victor losing about 1500 to the CSA 2200 or so in a series of fights, but always the Rebs lose at least 40% more in all battles. At that point Grant & Sherman, who took light losses, retreat back across the river to Gatlien or Clarksville.....

This has happened in 3 battles in one Game and 2 in another, in that one Thomas also had a Corps of about 8000, he got behind Nashville. Won a battle, losing 400+ to Johnstons 2200+....and of course he too retreats back over the river.
I don`t understand why Grant, Sherman and Thomas are winning every battle by large margins, but then retreat ?
This makes it impossible to isolate the city and put it out of supply and siege them. I`m probably doing something wrong but I`ve re-played this several times with the same results.
Any informed thoughts appreciated.