Douro-class destroyer
…Yarrow. A fifth ship, Dão, again to be built in Lisbon using Yarrow-supplied machinery, was ordered on 18 January 1933. Yarrow's design was based on Ambuscade, a prototype destroyer built for the Royal Navy in 1926. The ships were 323 feet (98.45 m) long overall, with a beam of 31 feet (9.45 m) and a draught…