It does because your reading it then it tells you about it.
Answer: The German attack on France in the 1940s was a success. Germany took over France in that attack, even using their own trench guns against them.
Explanation: France made a mistake after WWI by spending a tone of money on building a massive trench system around France in case of a 2nd world war. However, trench warfare was deemed to be useless in WWII, so useless that the Germans used the machine guns inside of those trenches against the French.
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Unrestricted submarine warfare is a type of naval warfare in which submarines sink vessels such as freighters and tankers without warning, as opposed to attacks per prize rules (also known as "cruiser rules").