The two sides were:
The Central Powers and the Allies.
Some of the names of men during World War Two were Henry, John, Jon, Joseph, Samuel, Harrison, and Nathanial. There are many more names but these are some.
Armistice Day and Remembrance Day.
There are two or three names for it but one is: The Great War another would be: The War to End All Wars
The Great War was, at the time, unique. When the next war started, the names World War One and World War Two were used because World War One was no longer a one-of-a-kind huge multinational war.
If you meant the names of the two atomic bombs , they were 'Little Man' and 'Fat Boy' .
The other two names for the "Sitzkrieg" (a nickname given by German soldiers during the lull in fighting) are "the Sitting-Down War (translated literally from German) and the Phony War.
There were far more than 2
Thousands of trenches were constructed during World War 1. Most had names for operational purposes but few names are remembered. EDIT: Are you thinking of World War 2 and the Maginot Line?
Try looking on www.historychannel.com or a search engine. == answer.....== I think one of the names was the Schlieffen Plan.
There are two or three names for it but one is: The Great War another would be: The War to End All Wars
WW I was originally described as the Great War, and the war to end all wars (which, of course, it failed to do).