During the 1930s, with the London Naval Treaty of 1930 placing limitations on heavy cruiser warship construction and characteristics, the US, Japanese and British navies attempted to circumvent the restrictions on heavy cruiser construction by building light cruisers (vessels with an armament no heavier than 6.1in / 155mm) of similar size and fighting power to conventional heavy cruisers with 8in artillery. In Britain, this resulted first in the 10 Town class vessels, and latterly the reduced Fiji (aka Crown Colony) and Minotaur classes, built to fulfill the obligations of the Second London Naval Treaty of 1936.