You should finish your introduction with your thesis statement or research question.
Be very careful you're not developing a topic that is of interest to you alone. For guidance on formatting citations, please see the UNC Libraries citation tutorial. Tip: In order to be as clear as possible in your writing: Unless you're writing a technical report, avoid technical language.
However, it is too easy to imagine possible counterarguments.
Maybe you decide that both sides fought for moral reasons, and that they just focused on different moral issues. Are my arguments presented in a logical sequence? If yours doesn't, then it's not an argument—it may be a fact, or an opinion, but it is not an argument.