Germany implemented unrestricted submarine warfare during World War 1, allowing German U-boats to sink any ships trading in waters around England without warning using torpedoes powered by alcohol pressure. This policy threatened ships of nations like England, France, Russia, and America who traded frequently in these waters and drew the United States into the war on the side of the Allies.

1. German Unrestricted Submarine Warfare

2. what is unrestricted submarine warfare
- unrestricted submarine warfare was a policy
Germany put in place saying that they would attack
or target any ships trading on the waters around
England.
- torpedoes are alcohol pressure powered and
come out of the u-boat submarine

3. how do submarines work
- the submarine would attack using torpedoes that
caught commercial ships by surprise

4. torpedoes cont’d
- torpedoes are alcohol pressure powered and
come out of the u-boat submarine

5. What countries were involved?
- Russia, France , and England were affected
because they were already at war with Germany
- America was also affected because they traded
often on the English waters

6. sources
wikipedia.org
dailymail.co.uk.org
ask.com
navalhistory.net