It operated in the area of the North Sea Mine Barrage.

After the first sweep took two days to clear 221 mines, Strauss requested more ships in the hope of clearing the mine barrage that summer.

The mine barrage consisted of 18 rows of mines laid in an east-west direction.

But the Soviet submarines had broken through the mine barrages in the Gulf of Finland easily in 1942.

Auk assisted in sweeping the North Sea Mine Barrage in 1919.

The term "minelayer" applied vessels deploying both defensive and offensive mine barrages and large scale sea mining.

Around 1 August 1940, while on a mine-laying mission near Norway, U-25 passed through British mine barrage number seven and struck a mine.

Fitted out with "electrical protective devices", she was soon busy in the post-war clearing of the North Sea Mine Barrage.

After the Armistice, Unit 20 took part in operations to clear the North Sea Mine Barrage through the end of September 1919.

By that time the necessity of improving sweeping methods to expedite the clearing of the North Sea Mine Barrage had become very apparent.

Assigned to the North Sea mine barrage, the minesweeper removed 2,160 mines from British waters between June and September 1919.

From 30 June to 2 July, Texas and her colleagues acted as escort for American minelayers adding to the North Sea mine barrage.

The North Sea Mine Barrage was intended to close this alternative route, and it also made it hard for the U-boats to get supplies.

Auk remained there for over a month, undergoing repairs and fitting out for her pending duty sweeping the North Sea Mine Barrage.

She steamed to Britain in June 1918 and spent the rest of World War I laying the anti-submarine mine barrage across the North Sea.

The Navy's intent to lay the North Sea Mine Barrage to protect commercial shipping required an Atlantic Seaboard plant.

The mine barrage required multiple missions, called "excursions", laying parallel rows of mines partway across the North Sea between Norway and Orkney.

A chronicler of the North Sea Mine Barrage clearance wrote about 9 July: "...misfortune did not rain; it poured".

Upon completion of fitting out, she sailed for Scotland on 6 April 1919, to assist in the sweeping of the North Sea Mine Barrage.

In 1919, Belknap received the Distinguished Service Medal for his achievements in the North Sea Mine Barrage effort the previous year.

In an attempt to seal up the northern exits of the North Sea, the Allies developed the North Sea Mine Barrage.

In 1915 Bacon was appointed to command the Dover Patrol and was involved in the development of the North Sea Mine Barrage.

Kiowa returned to Norfolk during April 1918 to load naval mines and minelaying equipment for the squadron engaged in laying the North Sea Mine Barrage.

Swallow swept mines from the North Sea Mine Barrage laid by the Allied and Associated Powers during World War I.

By 1 October, the North Sea Mine Barrage, originally a concentration of over 70,000 British and American mines, had been swept; and Sanderling headed home.

Part of the recruits' training was to lay the mine barrier, a process planned for a few days later.

However, the mine barrier had proven to be insufficient to completely stop Soviet submarines activities.

The improvised minesweeper force entered the mine barrier in the evening of 10 April and began clearing the mines.

Shore detonated controlled mines were used to create an inner mine barrier to protect the entrances to the outer anchorage.

The Viet Cong sappers were skilled craftsmen who could snake through the most complex barbed wire and mine barriers.

As the mine barrier had now been discovered the Kriegsmarine needed to sweep the Lerøyosen but had no dedicated minesweepers in the area.

The plan was to lay a naval mine barrier between Hel Peninsula and Danzig to prevent any enemy ship from entering the area.

The submarine had successfully completed laying a 50-mine mine barrier west of the Swedish island Vinga, but was subsequently damaged by a German sea mine.

Some two hours later, the traffic lessened as troops cautiously picked their way through the dense minefield, and pontoons were later used to circumvent the mine barriers.

Searchlights were first used at Viapori during the Russo-Turkish War in 1878, and they were originally intended for guarding the controlled mine barriers.

They resumed service in the North Sea in December 1939, ensuring the passages through the East Coast Mine Barrier were kept clear of mines.

When it is a matter of getting at the enemy landing fleet, no thought must be given to the danger of shallow water or possible mine barriers or any other consideration.

The Merevägi includes units of patrol ships, minesweepers, a frigate and coast guard units, necessary to ensure the security of maritime communications lines and to establish and clear mine barriers.

He became an enthusiastic advocate of the submarine and of means to combat the German submarine menace to Allied shipping: he proposed building a mine barrier across the North Sea from Norway to Scotland.

With relatively small means, the Kriegsmarine and Finnish Navy had dealt a severe blow to the Red Banner Baltic Fleet, which withdrew to the relative safety of the naval mine barriers and coastal fortifications of Kronstadt.

The American submarines attacking Soviet submarines in their home waters would first have to traverse treacherous mine barriers and would be the target of intensive attack by all the Soviet Union's formidable shore-based antisubmarine warfare air and naval forces.

The most dire result of Finland concluding the Moscow Armistice with the Soviet Union was that now Soviet naval forces could circumvent the existing German naval mine barriers located on the Gulf of Finland by using the Finnish coastal seaways.