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The Martian invasion of 1901 (and its subsequent failure) resulted in a number of very significant scientific discoveries. The most important of these was the mineral cavorite, of course, which permitted vessels to shield themselves from the effects of gravity. The second was the alloy the Martian vessels' hulls were made from - the Germans were the first to duplicate this, naming it 'Wasserstahl'. Manned flight was suddenly no longer an impossibility, but swiftly becoming an everyday occurrence. The first voyager to orbit the Earth did so in 1905, and the space race was on.
The fleets of the great powers of Europe have, of course, been detailed elsewhere. The US Navy commissioned the first Decatur-class destroyers shortly after the Chesapeake-class cruisers had proven themselves. These much smaller vessels were lightly armed but made excellent patrol craft, hunting raiders and escorting freighters as well as larger warships. These little ships carried seven six-inch guns each -- one in a forward turret mount, and three casemated guns in each broadside. Their crews tended to be small and tightly-knit, bonding out of shared danger and hardship.
This model combines three of these sprightly little craft for ease of printing and convenience of purchase.