Forward bases can sustain long commitments, but they also expose ships to abrupt changes in alliance and host-nation policy. Rosily's five ships of the line and one frigate were already in Spain when France and Spain became enemies. The entire squadron was captured, and 3,676 sailors became prisoners while Spanish losses remained small. The episode warns against treating political access abroad as a permanent substitute for mobile support.
Notable Point · 27:17-28:32
The Rosily Squadron reveals the political risk of forward basing
France loses an entire squadron when war turns its Spanish host into an adversary, showing that overseas basing depends on political access.