Why control at sea is temporary

Fighting a fleet action is different from sustaining a maritime war. Land can be occupied and administered, but an ocean area is controlled only while a capable ship can remain there and influence events. Once that ship leaves, its authority over the space disappears, and the same hull cannot cover another area at the same time. The same problem offers an analogy for future conflict in outer space, where the territory between governed planets would likewise resist permanent occupation. Cruiser numbers therefore mattered to force dispersal: many capable ships created more simultaneous pockets of control than a small collection of spectacular capital ships.