The 1889 Naval Defence Act produced 21 Apollo-class cruisers, with eight related Astraea-class ships following as a modified design. The Apollo class was small and unsuitable for a major fleet action, yet it remained useful. Its ships entered mine warfare, patrol work, harbour blocking at Zeebrugge and Ostend, and other specialized tasks during the First World War. A retained hull could later become a minelayer, blockship, patrol vessel, or even a stationary air-defence platform. Reusing it released shipyard capacity for something more demanding while preserving options for later conversion.
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The Apollo class as evidence for reusing old cruisers
Apollo-class cruisers served as minelayers, patrol vessels, presence ships, and blockships, showing how old hulls could be repurposed instead of discarded.