Riverine warfare depended on the continuous movement of supplies, with battles occurring much less frequently. Small Roman boats could reach farther upstream than the largest vessels, extending the routes available to an army. Moving troops and fortifying a frontier both required dependable waterborne supply. Bringing heavy guns to a place such as Vienna posed the same logistical question: how could the equipment reach the army?
Notable Point · 36:47-38:17
Why riverine warfare is usually about logistics before battles
Small boats and dependable supply routes sustained armies, frontier fortifications and heavy artillery, while river battles were comparatively infrequent.