This marker is situated east of the town of South Queensferry on the edge of the Firth of Forth just west of the Forth Bridge. It overlooks the waters that were involved in World War I. It reads as follows:
'THE ROYAL NAVY IN THE FORTH DURING WORLD WAR I
In March 1903, the British government announced that Rosyth Dockyard, a new naval port and base, would be built at St.Margaret's Hope on the north side of the Forth, but the main works did not begin until March 1909.
When WWI began in August 1914 the dockyard was still under construction, but the tidal basin intended for submarines could be brought into use. The opening ceremony was performed by King George V in June 1915 and the dockyard finally became operational in March of the following year.
The British Grand Fleet, comprising some 200 ships, was based at Scapa Flow in Orkney at the beginning of the war. The battlefields - with their attendant cruisers and destroyers - moved down to Rosyth in December 1914, but it took until April 1918 to make the estuary safe enough for the rest of the fleet to join them, by which time every significant harbour had been taken over for naval use.
A Wireless Telegraph Station was erected on Castlandhill, and Ordnance Depots were built at Crombie and upriver at Bandeath, three miles east of Stirling.
A Kite Balloon Station was established at North Queensferry and an experimental Seaplane Station operated from Port Laing nearby. A Royal Naval Air Station was established at Donibristle, becoming part of the Royal Air Force in 1918.
On the south side of the river, by far the most significant development was the construction of the Destroyer Base at Port Edgar. The existing harbour was dredged and enlarged and berthing jetties were provided, along with extensive shore facilities. The new base was commissioned as HMS Columbine in December 1917, with space for 66 destroyers.
A Small Naval Hospital was built a short distance to the west at Buslaw, and a much larger (1,200 bed) Naval Hospital was established briefly in 1918, when the Stirling District Asylum at Larbert was taken over by the Admiralty.
Further afield, Grangemouth became very important, for various reasons. The docks were requisitioned in November 1914, becoming HMS Rameses, with many buildings taken over for administration and accommodation.
A mine manufacturing and training school was established and merchant ships converted to minelayers were loaded in the docks. Welsh coal was brought up by rail and oil from the USA was brought across from the Clyde in converted barges on the Forth and Clyde Canal.
Elsewhere, an important hydrophone research and training base, HMS Tarlair, was established at Hawkcraig Point, Aberdour, and Granton harbour, named HMS Gunner, became a naval base for minesweepers and especially anti-submarine decoy vessels ("Q-ships").
Anti-submarine nets were hung under the Forth Bridge in November 1914, making the river above the bridge safe enough for the battlecruisers and their escorts. Protecting the anchorage below the bridge from enemy submarines and surface craft was a huge undertaking, for which Burntisland harbour was taken over.
The final arrangement comprised four lines of defence. In addition to the nets hung under the bridge, a second line of nets ran from Dalgety Bay to Inchcolm, Inchmickery and Cramond Island, and a third one ran from Burntisland too Granton. Each of these lines was provided with floating gates which could be winched open and shut as necessary. The fourth gate ran from Elie in Fife to the island of Fidra in East Lothian.
A gap of two miles - known as the Fidra Gap - was left in the centre of this fourth line heavily patrolled on the surface and partially closed with deep nets to stop submarines. The nets in the three outer lines were attached to hawsers slung between wooden dolphins or, in deeper water, supported by floats and secured between anchored trawlers requisitioned from the fishing fleet.
Covering these defences was a comprehensive army of gun batteries mounting 12-pounder 6-inch and 9.2 inch guns, the largest being on Inchkeith and at Kinghorn and Braefoot Point near Dalgety Bay.
By April 1918 the facilities in the Forth were at last judged sufficient, although Admiral Beatty (who had succeeded Admiral Jellicoe as commander of the fleet in July 1916) had never liked "the horrid Forth like a ditch full of thick fog", he nevertheless brought the Grand Fleet down from Scapa Flow to join the battlecruisers force, anchoring above and below the bridge. The fleet put to sea in full fighting array for the last time on 24th April 1918, in thick fog. By early afternoon the whole armada of 193 ships was at sea, and all within 90 minutes of receiving the order to sail.
Within seven months the war was over.
THE TWO MOST MEMORABLE SIGHTS IN THE FORTH
The Battle of Jutland, on 31st May and 1st June, was the only great naval battle of the dreadnought era. Although British ship losses were the greater, damage throughout the German Fleet was widespread, whereas on the British side it was more or less confined to the battlecruiser force, which had borne most of the fighting. The German fleet never again put to sea with the serious intention of engaging the Grand Fleet, and Britain retained command of the North Sea. Onlookers on the shores of the Forth and railwaymen on the bridge watched the damaged ships of the Royal Navy limping home after the battle, to safe anchorage and repair.
On 21st November 1918, under the terms of the Armistice, the surface ships of the German High Seas Fleet rendezvoused with the British Grand Fleet 40 miles east of the Isle of May and were escorted into the Forth, anchoring under guard off Inchkeith. Operation ZZ, as it was called, saw the mightiest gathering of warships in one place one day in naval history. In the days following, before the German ships were transferred to Scapa Flow, boat trips were organised to view them. Neither before or since has there been such a sight.'