Can I make a suggestion to get you totally lost?
When you reach 211, turn right, then an immediate left onto Old Bridge Rd., Rt 622 and take that to the stop sign. You will get to cross the old one lane bridge taking this route.
Turn right onto Leeds Manor Rd., Rt 688 and go about 2,000', then turn Left onto Old Waterloo Rd., Rt 691...part of your route.
Go about a mile and take a left onto Cliff Mills Rd., Rt. 681. This is a nice short stretch of gravel.
Follow that to the stop sign and take a right on Piney Mountain rd., Rt 678. Go less than 1/2 mile to a left on Dudie Rd., RT 689. When you get to the stop sign you will be in Dudie, DEEP Dudie...Don't dab a foot!
Turn right onto Wilson Rd. Google maps show the same route number as Dudie Rd. Dunno.
Go a little more than 1/2 mile and you will see Carters Run Rd., Rt 691 on the left. From there it is a straight shot to Marshall.
Be aware in that Rt 691 isn't quite a straight shot. It is a combination of Old Waterloo, Wilson, and Carters run roads. Old Waterloo to Wilsons is a no brainer. Wilson to Carters Run is easy to pass as it is a side road, on a curve.
This option shouldn't make the trip any more than five minutes longer and it is slightly more scenic.