On 12 July 1849, the long-standing tensions between the Orange Order and the localRoman Catholic community in south County Down erupted into a skirmish, following an Orange Order march at Dolly's Brae, near Rathfriland, in which several people were killed. The incident is generally called the Dolly's Brae conflict, or the Battle of Dolly's Brae. The public outcry over the deaths led to the establishment of a Government inquiry which Berwick chaired. His report was highly critical of the local magistrates, especially Lord Roden, for failing to prevent the violence. As a result three magistrates, including Roden, were removed from the Bench. The inquiry also led to the enactment of the Party Processions Act 1850, which prohibited all political processions in Ireland. The measure proved to be equally unpopular with all political parties and was repealed in 1872.
Cork: the Berwick Fountain
For several years he was the Assistant Barrister for the East Riding of County Cork, which in effect meant that he was the Chairman of the Court of Quarter Sessions for Cork. He acquired a reputation for integrity and impartiality, and became a much-loved figure in Cork. When he was made judge of the Irish Court of Bankruptcy in 1859, the people of Cork paid a heartfelt tribute to his good service to the city. Berwick, greatly touched by the tribute, responded by commissioning the Berwick Fountain "in remembrance of the great kindness shown to me by all classes in Cork". It was completed in 1860 and still stands on the Grand Parade, although it was moved from its original site in 2007. Berwick served as the Bankruptcy judge until his death. In his last years he lived at St. Edmundsbury, Lucan, County Dublin
In August 1868 Berwick and his sister Elizabeth Mary were returning from a holiday in Switzerland. At Euston Station they took charge of a young girl called Louisa Symes, who was apparently a distant relative. They boarded the Irish Mail to Holyhead. At Abergele in North Wales, two runaway carriages from a goods train ahead crashed into the Irish Mail, causing what was then the worsttrain disaster in British history. In the resulting inferno 33 people died, including Berwick, his sister and Louisa Symes. All the victims were buried in a common grave, and a memorial was erected to commemorate the disaster.