A little further to the north, the course of the Devil's Highway crosses the river, a Roman road that ran from London to Silchester. It turns to the north-east, and is joined by the West End Brook on its left bank, as it crosses into Berkshire. West End Brook rises close to the source of the Silchester Brook, but a little further to the north, and runs eastwards to reach the confluence. At the county boundary, it becomes the Foudry Brook, and at Stratfield Mortimer it passes close to the grade II listed St Mary's Church building, designed in 1869 by Richard Armstrong, but containing stained glass from the 15th and 17th centuries, as well as a Saxon stone coffin lid for Aegelwardus, who died in 1017. On the right bank opposite the church building is a long linear fishpond. The river drops over a waterfall, which was originally part of a hydraulic ram, and provided water from the river to Manor House. This was also the location of a medieval watermill, and the straight course of the river below the waterfall may be due to the fact that it was built to return water from the mill to the river. A mill was recorded in the manor of Stratfield Mortimer when the Domesday Book was compiled in 1086, and there is documentary evidence for a mill in 1304 and again in 1449-50, but nothing subsequently. Tun Bridge carries Station Road to the nearby grade II* listed Mortimer railway station, built by Isambard Kingdom Brunel in 1848, and notable because it is one of a small number of his wayside station buildings that has remained virtually unaltered since its construction.