Tenders from Greenwich and Blackwall ransacked the Thames below bridge as far as Blackstakes in the river Medway, the Nore and the Swin channel. Tenders from Margate, Ramsgate, Deal and Dover watched the lower Thames estuary, swept the Downs, and kept a sharp lookout along the coasts of Kent and Sussex, of Essex and of Norfolk. To these tenders from Lynn dipped their colours off Wells-on-Sea or Cromer, whence they bore away for the mouth of Humber, where Hull tenders took up the running till met by those belonging to Sunderland, Newcastle-upon-Tyne and Shields, which in turn joined up the cordon with others hailing from Leith and the Firth of Forth. Northward of the Forth, away to the extreme Orkneys, and all down the west coast of Scotland through the two Minches and amongst the Hebrides, specially armed sloops from Leith and Greenock made periodic cruises. Greenock tenders, again, united with tenders from Belfast and Whitehaven in a lurking watch for ships making home ports by way of the North Channel; or circled the Isle of Man, ran thence across to Morecambe Bay, and so down the Lancashire coast the length of Formby Head, where the Mersey tenders, alert for the Jamaica trade, relieved them of their vigil. Dublin tenders guarded St. George's Channel, aided by others from Milford Haven and Haverfordwest. Bristol tenders cruised the channel of that names keeping a sharp eye on Lundy Island and the Holmes, where shipmasters were wont to play them tricks if they were not watchful. Falmouth and Plymouth tenders guarded the coast from Land's End to Portland Bill, Portsmouth tenders from Portland Bill to Beachy Head, and Folkestone and Dover tenders from Beachy Head to the North Foreland, thus completing the encircling chain. Nor was Ireland forgotten in the general sea-rummage. As a converging point for the great overseas trade-routes it was of prime importance, and tenders hailing from Belfast, Dublin, Waterford, Cork and Limerick, or making those places their chief ports of call, exercised unceasing vigilance over all the coast.