I don't have any direct connection to your Marshall that I know of... It's interesting that my line goes back to a Jacob Marshall as well tho. Jacob Marshall died approximately 1729 in route to America from Ireland. His widow, Ann and two sons John and William survived the journey. This Jacob was the son of a Jacob Marshall. These were all Quakers who settled initially in PA. Later moved down through NC and TN. Doesn't sound like any possible connection. Good luck on your quest. Paul