| 1. | During World War I, unrestricted submarine warfare caused a shortage of tankers.
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| 2. | The United States responded to unrestricted submarine warfare by severing executive order.
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| 3. | Like his German counterpart, Alfred von Tirpitz, Haus favored unrestricted submarine warfare.
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| 4. | Instead, the German Navy turned its efforts and resources to unrestricted submarine warfare.
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| 5. | :" We intend to begin on the first of February unrestricted submarine warfare.
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| 6. | Germany's decision in April 1916 to suspend unrestricted submarine warfare terminated the debate.
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| 7. | This coincided with Germany's expansion of unrestricted submarine warfare in the beginning of 1917.
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| 8. | He advocated for unrestricted submarine warfare against the British and bombing of civilian targets.
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| 9. | In January 1917, Germany resumed unrestricted submarine warfare, realizing it would mean American entry.
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| 10. | In 1916-17 he was an advocate of unrestricted submarine warfare.
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