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The holy roman emperor (Henry IV) wanted to make the church independent from secular rulers so he banned the practice of Lay Investiture. The pope (Gregory VII) excommunicated him and went to find a new emperor when Henry IV confessed to him he was a sinner and Gregory forgave him. But Henry was so butt hurt about it that he sent to roman military to kill the pope.
:)
Answer:
Germany escalated its U-boat attacks in 1917 because of Germany's military buildup, the British blockade, and the use of submarine warfare. As war continued on land, Britain decided to use the tactic of the sea and their naval strength. Any ships that were found in the waters around Britain would be sunk.
Explanation:
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