This fort for around 500 men was established around 79 or 80 Ad during Agricola’s campaign. There is nothing to see at the site. If you are in Edinburgh it is a nice cycle.
It is likely that supplies came by ship and landed at Inveresk/Musselburgh further down the River Esk. There is evidence that Inverhaugh Fort had shoe makers at this site. See Roman Shoemaking in Scotland.