CSS "Hunley" was intended for attacking Union ships that were blockading Confederate seaports. Loyalist paramilitary organisations were prominent in intimidating utility workers and blockading roads. Admiral Sir Sir Sidney Smith's squadron blockading Lisbon. Served by sailors of the blockading squadron, the guns proved to be entirely unsuccessful. This battle represented the first application of the naval blockading strategy. In September 2013, armed groups were blockading oilfields. Salcedo set about blockading the Agno River, landing men and artillery. Aside from the rout of the Union blockading fleet there was little gain. Smalls gave detailed information about Charleston's defenses to Du Pont, commander of the blockading fleet. A neutral ship must obey a request to stop for inspection from the blockading nation. With Krum of Bulgaria blockading Constantinople by land, Leo V had inherited a precarious situation. The US responded to the presence of the weapons by blockading Cuba. This was accomplished through the capture of Chinese cities and by blockading major river systems.