U-boats were military submarines used by the Germans. While they were useful against warships, U-boats were the most effective in economic warfare by blockading coasts so resources could not be shipped to Germany's allies. WWI was the first major war that employed submarines in warfare.
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Yes it is possible because there are records that show that the Mayas were obsessed with war.
Philadelphia was great for trading and factories because <u>it was on a river,</u> located along the Delaware River and Schuylkill River, in the greater Delaware Valley.
People here in Philadelphia traded lumber, coal, furs, textiles, and bricks.
Philadelphia was a trade center for the colonies that based an important part of its economy on trade with the advantage that was located next to the river and had ports.
<span>The Battle of the Marne the Germans and the Allied troops started to build trenches from the North Sea to the Swiss frontier of France. This battle stopped the Germans from going through Belgium to get to France. They started digging the trenches on the Western Front on both sides starting on Sept 15, 1914
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One method,if my understanding is correct, is to attack by surpirse or to kill as many people as possible.
By doing that, the killing of numerous/millions of people, usually end on on planes, buildings... That type of stuff.
They usually do bombing of large areas.
~Hope this helped :)