A flotilla of German Kriegsmarine minesweepers underway at sea. Symbol of a lobster cutting a mine chain is painted on side of minesweeper. Detonators are dragged behind the vessels on steel cables. Explosions occur as mines detonate in the water. Crews fire at visible floating mines, with deck guns. They drop buoys to mark clear channels. An alarm is sounded, and crews man deck guns and fire them.
German submarine on surface, shoots Allied freighter with its deck gun,in the Atlantic Ocean.German submarine underway on surface. Crew sees Allied freighter and mans deck gun. They fire and hit freighter, which billows smoke and starts to sink. Alarm is sounded. Crew rushes down the hatch as submarine crash dives. View of engine room in submarine and other compartments, as depth charges explode around it. Crew operates manual pumps and secures compartments as water rushes into the submarine. After the danger has past, the submarine surfaces and the Captain climbs on deck.
Italian submarine Balbarigo on patrol off the coast of Brazil, in South Atlantic waters during World War II. The Balbarigo cruising on the surface and then submerging when it observes several U.S. warships. View from periscope of a U.S. warship firing heavy gun. View, from conning tower of surfaced submarine Balbarigo, of the U.S. freighter Staghound, alone in the waters off the coast of Brazil. The Balbarigo fires its deck gun. View of the freighter Staghound struck in port stern area, burning and sinking.
Film titled 'Underwater Sentries'. U.S. Coast Artillery troops board a Destroyer Minelayer (DM). Stacked underwater mines in the foreground. DM leaves the dock. Sailors aboard the DM handle mines. Coils of wires on the deck. Sailors on a boat prepare distribution boxes. Cable is connected between the DM and the boat. Mines armed and cables connected from mines to distribution boxes that control firing. Mines are laid by the DM. Animation shows the laying of mines by the DM. (World War II period).
Ground mines aboard a Destroyer Minelayer (DM) underway in harbor. Ground mines planted in the harbor. Cover of ground mine is opened and cable to the distribution box is attached. A crane lowers the mine into the water. Cables connected from mines to distribution boxes that control firing. Distribution box is lowered in water. Animation shows the laying of ground mines by a DM. View of switchboards in the central control station at the harbor. Demonstration of reports received, interpreted and acted upon. Enemy vessels are destroyed. Huge explosions in water (World War II period).
U.S. officers General George C Marshall, HH Arnold, Brehon Somervell and Lesley J McNair seated around table and discussing map in Washington DC, USA, during World War 2. U.S. President Franklin Roosevelt and British Prime Minister, Winston Churchill at a meeting in Casablanca, French Morocco.
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