Destroyers-for-bases deal

The destroyers-for-bases deal was an agreement between the United States and the United Kingdom on 2 September 1940, according to which 50 Caldwell, Wickes, and Clemson-class US Navy destroyers were transferred to the Royal Navy from the US Navy in exchange for land rights on British possessions. At the time, the United States was neutral in World War II. Generally referred to as the "twelve hundred-ton type" (also known as "flush-deck", or "four-pipers" after their four funnels), the destroyers became the British Town class and were named after towns common to both countries.

Source: Wikipedia — Destroyers-for-bases deal (CC BY-SA 4.0)