How log rafts could serve in riverine warfare

Were log floats or bound-log rafts used in riverine warfare?

Yes. Roman and other forces used log rafts, although trained carpenters often made them far more engineered than the phrase rough-hewn suggests.

Roman forces used log rafts in riverine contests, and modern imagery can understate their construction quality. Armies carrying experienced carpenters could shape, join, and balance timber into a purposeful transport or fighting platform. Calling such a craft rough-hewn does not mean it resembled a cinematic emergency raft lashed together without preparation. These rafts show how field engineering and water transport supported operations before permanent bridging or specialized river craft were available.