On the right side of the display, below where it says "Eastern Thater of the Civil War", click on the word "Unit" ... a drop down menu will display .... select 5th Va. Infantry
You can stop and start the route of the 5th Va through all its battles; you can also restart the whole thing from the beginning.
You can also lookup service record information about your ancestors on this same web site at http://valley.lib.virginia.edu/dossiers
My Gr Gr Granddad (on my mom's side) was private John Baker of Co. D - "The Southern Guard".