Is there a good book on riverine warfare beyond the American Civil War?
Short answerNo general cross-conflict survey comes to mind. There is relevant Vietnam work, but the literature is fragmented by war.
NotesJohn Keegan's American Civil War work and possible studies of fighting on rivers and lakes provide an initial lead. When the question is clarified as a request for other conflicts, no strong general survey covering riverine warfare across wars comes to mind. A useful Vietnam study is remembered but cannot be identified confidently during the stream. Chinese river warfare in 1946-48 is another interesting case whose sources would be difficult to obtain. The watch point marks a research gap and the need to search conflict by conflict rather than expect one comprehensive naval synthesis.