River Dargle. The River Dargle rises in the Wicklow Mountains of Ireland on the southern slopes of Tonduff 642 metres, and flows down the Glensoulan hanging valley, to fall over the 121 metres Powerscourt Waterfall.
The Dargle then flows through the Glencree valley where it is fed by the River Glencree, before flowing east for a further 13 km where a small tributary the Swan River joins opposite the People's Park, Little Bray. The Dargle then flows for a final 1 km to reach the Irish Sea at Bray Harbour.
In August 1401 the O'Byrne clan of County Wicklow, who periodically raided Dublin, encamped a large mercenary army, composed mainly of their relatives, the O'Meagher clan, on the banks of the Dargle near Bray. The authorities in Dublin received advance warning of the intended raid from the Walsh family of Carrickmines, whose lands stood directly in the path of the mercenary army.
Led by John Drake, who was three times Lord Mayor of Dublin, the citizens of Dublin supported by the Walsh clan, scored a decisive victory, commemorated as the Battle of Bloody Bank, over the O'Byrnes and O'Meaghers on the banks of the Dargle. The slaughter was so terrible that the area became known as Bloody Bank until it was renamed in the nineteenth century as Sunny Bank.
The outcome greatly improved the security of Dublin, and seriously weakened the power of the O'Byrne clan. Sir Walter Scott visited the area in