The iis the correct pronoun.
The first war likely didn't have a name honestly. Any large scale, extended conflict between two parties is considered a war. So the first war was probably between hominids before a spoken or written language existed. Hope this helped.
A pretty woman (Mathilde Loisel) is kinda poor but she thinks she deserves to be rich and hang with rich people because she's pretty. one day her husband (Monsieur Loisel) gets her invited to a big fancy party with rich people, they use all of their money to buy her a rally nice dress and she borrows an amazing pearl and diamond necklace from her friend (Madame Forestier).
she goes to the party and has and great time, but when she gets back, she realizes it's missing. She and her husband look everywhere but can't find it so they get a huge loan to buy another just like it and give it to the friend.
Then they spend the rest of their lives paying off the debt of the loan or whatever.
After a long time, the lady sees her friend and tells her the story. To horrifies her friend because it wasn't even a real pearl/ diamond necklace.
Jekyll believed that man does not have one side ‘but truly two’. He asserts that human soul struggling for mastery is a battleground for a “fiend” and an “angel”. Therefore, it can be separated by bringing the dark side into being. :)