Cast Adrift and strategy after imperial collapse

Christopher G. Nuttall's Cast Adrift follows humanity gaining independence when an alien imperial order retreats after a devastating war. In the chapter 40 passage, independence immediately creates strategic burdens: newly transferred systems contain poorly charted crossroads, bottlenecks with little to protect until the new possessions are absorbed, and settlements that may be difficult to defend. Officers debate whether the territorial gift is a poison chalice, how many ships must remain, and whether a more advanced rival used the prior war as a test. The commander also assigns an intelligence-gathering mission because patrol plans and diplomacy depend on understanding that rival's intentions. Much of the fleet is returning to Earth, so intelligence gathering must precede regular patrols across the newly acquired sector. The fiction examines a recurring post-imperial problem: political independence can arrive before a state has the maps, forces, alliances, or intelligence needed to secure it.