Their anti-aircraft armament was revised during 1942 -- 43 , with the three pom - poms and one of the banks of torpedo tubes replaced by six 20 mm cannon .
The five destroyers carried out patrols to defend Portugal 's neutrality during the Second World War .
destroyers ' anti-aircraft armament was revised during 1942 -- 43 , with the three pom - poms and one of the banks of torpedo tubes replaced by six 20 mm cannon .
The five destroyers carried out patrols to defend Portugal 's neutrality during the Second World War .