On 6 November 2013, it was announced that the Royal Navy had signed an agreement in principle to build three new offshore patrol vessels based on the River-class design similar to the larger Amazonas-classcorvette derivative built at a fixed price of £348 million, including spares and support. In August 2014, BAE Systems signed a contract to build the ships on the River Clyde. The ships, which were designated Batch 2 of the River class, were to be globally-deployable and capable of carrying out constabulary tasks, such as counter-terrorism, counter-piracy and anti-smuggling. As the first ship of the new batch, Forth included some 29 modifications and enhancements over the baseline Amazonas design.[13]
Steel was first cut for Forth on 10 October 2014 at BAE Systems' Govan shipyard in Glasgow.[3] She was launched in September 2016, being floated off a semi-submersible barge in the Clyde rather than receiving a traditional dynamic launch.[14] After launch, she was moved down the Clyde for fitting out at BAE Systems' Scotstoun shipyard. She was christened at a ceremony at Scotstoun on 9 March 2017.[15] In late March 2017, it was announced that the crew of Batch 1 vessel HMS Tyne would be transferred to Forth to bring her into service.[16]
On 31 August 2017, Forth sailed for contractor sea trials.[17] It was reported in October 2017 that Forth had been earmarked to replace HMS Clyde as the Falkland Islands guardship.[18]
It was announced on 25 January 2018 that Forth had been accepted by the Ministry of Defence from BAE Systems and would shortly sail to HM Naval Base Portsmouth for commissioning.[19] She arrived in Portsmouth for the first time on 26 February 2018.[20]
Forth was commissioned into the Royal Navy on 13 April 2018 following a ceremony at HMNB Portsmouth.[21]
Soon after her commissioning, some faults were identified with her electrical system and sheared bolts were also discovered with heads that had been glued back on. In June 2018, it was announced that Forth would be entering dry dock for major rectification work which was likely to take more than three months. The Royal Navy reactivated HMS Tyne to cover planned patrols by Forth with BAE Systems covering the additional costs.[22][23] In October, Anderson Smith, BAE Systems Commercial Director – Naval Ships, admitted that "minor defects" had been found but announced that they had since been fixed.[24]
In June 2019, Forth underwent operational sea training in British waters in preparation for her first operational deployment.[25] She later sailed from Liverpool to escort a Russian Navy patrol ship which was transiting through the UK's area of interest.[26] She then made her inaugural fishery protection patrol and her first visit to an overseas port, which was to Gibraltar before again escorting the same Russian ship through the English Channel.[27]
In February/March 2023, Forth sailed to Gibraltar for refit and was replaced in the South Atlantic by HMS Medway.[32][33][34] As part of this refit she has been painted in a new camouflage like her sister ships HMS Tamar and HMS Spey.[35] She completed her refit and departed Gibraltar to return to the South Atlantic in September 2023.[36]
United Kingdom
Royal Navy
Royal Thai Navy
Royal Bahrain Naval Force
Brazilian Navy
