Economic warfare requires ships that are actually available

The video depicts Corbett repeatedly reminding naval officers that economic warfare was part of the Navy's purpose even when they preferred to focus on fighting the enemy fleet. Fisher's construction of HMS Dreadnought and the Invincible-class battlecruisers becomes an example of the unresolved balance between battle strength and wider strategic demand. Corbett would have preferred more ships because a paper force is never wholly available at once. Maintenance, refit, and repair continually remove hulls from service, so three ships cannot reliably guarantee that three will be on station. The lesson links commerce strategy to force structure: sustained presence requires enough units to absorb ordinary unavailability.