London re-established the navigation in 1822, by digging a cut, and severing the causeway. This was taken to the high court in 1824 for resolution. The judgement was inconclusive. The causeway at Grain Bridge was reestablished and the road reinstated by 1835, and the City of London effectively gave up claims to it. The natural processes of silting up and narrowing continue to the present day (2018). Prior to the twentieth century, the creek was used for salt workings, fishing and oyster beds. Flounders, eels, herrings and lobster were all caught in the creek. The mouth of Yantlet Creek, protected by a sand-bar, could shelter 50 boats from a moderate storm. Yantlet Line London Stone by Yantlet Creek is paired with the Crow Stone in Southend-on-Sea. Together the two stones mark a north–south line across the estuary known as the Yantlet Line. They are both from London Bridge. The Medway stone carries the inscription “God Preserve the City of London” The Yantlet Line marked limit of jurisdiction of City of London and still marks that of the Port of London Authority (PLA). Yantlet Range In 1917, towards the end of the First World War, the Admiralty requisitioned marshland to the east of Yantlet Creek, and in the 1920s the War Office built a firing point for testing large weapons. The ‘Grain Island Firing Point’ or 'The Yantlet Battery'. The firing point was an ‘out’ battery of the experimental establishment at Shoeburyness. It was used for firing long-range shells in a north-easterly direction across the estuary into shallow mudflats of the Maplin Sands. Facilities included two pairs of large velocity screen masts, an internal railway linked to the national network, a gun emplacement, a railway gun emplacement, domestic quarters and administrative offices, a gantry path for travelling crane and a wharf on Yantlet Creek for the unloading and loading of large guns and their mountings. The firing point is further distinguished by the length of the range of which it was a part and the size of the guns that were tested there. See also Wantsum Channel References Thames Estuary