English invasion of Scotland (1400) Edinburgh) where it could maintain contact with its supply fleet. The campaign ultimately accomplished little except to further deplete the king's coffers, and is historically notable only for being the last one led by an English king on Scottish soil. War with Scotland had started under Edward I, cross-border raids and fighting had been the norm in Anglo-Scottish relations since the 1370s, generally in the form of Scottish incursions over the border and English attempts to repel them. The 1399 revolution, which eventually deposed Richard II, created further opportunity for Scotland to regain the land between the River Tweed and
River Wye river from Redbrook to Chepstow forms the border between England and Wales. The River Wye forms two Sites of Special Scientific Interest, one covering the Upper Wye ("Gwy Uchaf") above Hay-on-Wye, and one covering the Lower Wye ("Gwy Isaf") downstream to Chepstow. The criteria for inclusion of the river as an SSSI include geology, topography, flora, mammals, invertebrates, fish and birdlife, as the river and its tributaries constitute a large linear ecosystem. The Lower Wye SSSI is itself divided into seven units of assessment set by Natural England, and administrative responsibilities are shared between the county authorities of Powys, Herefordshire,