This meticulously curated primary source collection is designed to offer a broad examination of key documents related to cyber warfare, covering the subject from multiple perspectives. The earliest documents date from the late 20th century, when the concept and possibility of cyber attacks became a reality, while the most recent documents are from 2019. Each document is accompanied by an introduction and analysis written by an expert in the field that provides the necessary context for readers to learn about the complexities of cyber warfare. The title's nearly 100 documents are drawn primarily but not exclusively from government sources and allow readers to understand how policy, strategy, doctrine, and tactics of cyber warfare are created and devised, particularly in the United States. Although the United States is the global leader in cyber capabilities and is largely driving the determination of norms within the cyber domain, the title additionally contains a small number of international documents. This invaluable work will serve as an excellent starting point for anyone seeking to understand the nature and character of international cyber warfare.