Yes, shotguns were used, although it was only until later in the war that they became standard issue. Some soldiers privately purchased hunting shotguns and modified them for used in the trenches, as they were found to be highly useful in the cramped environment of the trenches, where they became known as "trench guns".
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They each wanted to promote their competing political ideologies.
You can get them anywhere from Bezid.com to Ebay.com
Probably artillery; it was responsible for many of the deaths in World War 1.
Nuclear bomb
The nuclear bomb