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They didn't for unrestricted warfare. For restricted warfare they surfaced, got out a loud speaker and addressed the ship's captain. Such as, "You have 15 minutes to evacuate your vessel, then your ship will be sunk." Or...for the wise and experienced sub skipper (sub captain), "you have 15 minutes to evacuate your vessel, then we will sink your ship. IF you transmit any messages commencing now, we will sink you immediately!"

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Q: How did Germans warn people abut unrestricted submarine warfare?
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In 1917 Germany returned to unrestricted submarine warfare hoping it would do what to Britain?

to take out british ships so that people would starve and beg for peace


What was President Woodrow Wilson opinion about the German people?

He thought that Germany was a powerful country. But ever since the unrestricted submarine warfare they have wanted to bring in other allies. Brought to the alliance system.


Who introduced Submarine warfare?

The Sea people


What caused the british ocean liner RMS Lusitania to sink World War 1 causing the death of 1198 people?

German u boat submarines. They were attacking under the declaration of unrestricted submarine warfare, and the Lusitania was in their way.


What is the main German weapon of World War 2?

It may not sound like a killer, but the main weapon the Germans employed was fear, fear of their military might at the start of their French campaign, scarring Winston Churchill with their use of unrestricted submarine warfare, and using propaganda in conquered territory's to scare people with altered views of the allies, minority groups and the German war machine.


What caused unrestricted submarine warfare by the Germans?

Restricted warfare (being nice) got them sunk. Because the victim ship would radio a "May Day" or "SOS", which naturally included the victim ship's location (position). Well, this also pin-pointed the subs position! Consequently, by the time it took those people to abandon their vessel, a plane or sea vessel could or would be tracking or diving down the subs neck. Bottom line; it was dangerous for subs to be nice about it! Un-restricted warfare was easier on the sub & easier on the crew.


What event helped provoke the United States to enter world war 1?

Germany attempting to from a military alliance with Mexico


What were the US goals in World War 1?

The United States entered World War I, for the sole purpose for the defeat of Germany. Germany had ignored the United States' neutral stance, attacking its ships and citizens and finally, trying to persuade Mexico to attack the United States. Germany went down to defeat, therefore, the war aims of the United States were met.


What constituted the policy of unrestricted submarine warfare?

Basically, since the invention and more widespread use of the submarine, there were certain rules of warfare regarding them. Submarines, when they wanted to sink a ship (when it wasn't an obvious military ship), were supposed to pop up out of the water so that the ship could see them; then someone from the submarine was expected to tell the ship that the submarine was going to sink it. The submarine had to give the other ship time to evacuate the crew to lifeboats and get a safe distance away. Once all that was done, the submarine was allowed to sink it.Obviously, that doesn't work well when you want to get stuff done fast. Germany's navy was far smaller and weaker than Britain's; throw in France's and those of other countries, and Germany was at a considerable disadvantage. Germany needed to be able to hit hard and fast without having to slow down if they wanted to have any chance at defeating the Allied navies.So unrestricted warfare was basically ignoring those old-fashioned rules. They began sinking ships without warning, meaning crewmen were getting killed, and the whole ship was lost. German subs would sometimes accidentally shoot neutral ships, like those belonging to the US, or shoot ships carrying people from neutral countries (like the British cruise ship, the HMS Lusitania, which had over 100 Americans on board when the Germans sank it).Germany agreed to stop unrestricted submarine warfare after the Lusitania incident, because they didn't want the US to join the Allies. But in early 1917, they decided that they couldn't keep that up, and had to restart it. This, coupled with their attempt to secretly convince Mexico to declare war on the US, angered the Americans enough that they declared war on Germany in April 1917.


What was the submarine that sink the Lusitania?

The German U-boat S-20, under the command of Kapitänleutnant Walther Schwieger, sank the Royal Mail Steamship (RMS) Lusitania on May 17, 1915. The sinking was off the southern coast of Ireland, killing 1,198 of the 1,959 people aboard. She sank in 18 minutes.The S-20 was patrolling the shores of the United Kingdom, under orders to attack any vessel (known as Unrestricted Submarine Warfare) as the Germans had considered the UK under a naval blockade for several weeks.Schweiger noted that he only fired one torpedo, and that a secondary explosion was so large it caused enough damage that he didn't feel the need for a second. The cause of the secondary explosion remains a controversy to this day.The resulting public condemnation of Germany was so great that Kaiser Wilhelm II ordered the German Navy to return to a policy of Restricted Submarine Warfare. This continued until 1917, when Germany again resumed its policy of Unrestricted Submarine Warfare in response to a British Naval Blockade.


Which factor most contributed to the US' decision to enter World War 1?

German submarine attacks on merchant ships


Why did Wilson break off diplomatic relations with Germany?

On August 4, 1914, President Woodrow Wilson proclaimed U.S. neutrality in the European war. This changed abruptly on May 7, 1915, when a German submarine sank the British ocean liner Lusitania with 1,198 people aboard, among them over 100 Americans. When Germany announced on January 31, 1917 a policy of unrestricted submarine warfare, the United States cut diplomatic ties with Germany.