June, Ambuscade took part in the attempt to evacuate troops of the 51st (Highland) Division from Saint-Valery-en-Caux (Operation Cycle). Ambuscade was damaged by German shell fire while embarking troops, and on the journey back to Portsmouth, she took the destroyer in tow after the latter was badly damaged by German dive bombers. Following repair, Ambuscade rejoined her Flotilla, carrying out anti-invasion patrols and convoy escort operations in July and August 1940, before transferring to the Twelfth Destroyer Flotilla based at Greenock in September, but recurrence of the ship's turbine problems resulted in more repairs from September to November 1940. Ambuscade then rejoined her Flotilla, by then based at Iceland for convoy escort duties. Further mechanical problems, this time with the ship's condensers forced more repair at Portsmouth between October 1941 and January 1942. In March 1942, Ambuscade formed part of the Arctic convoy PQ 14 on its leg from Scotland to Iceland, and for the return convoy QP 9. By this time, it was clear that Ambuscades re-occurring mechanical problems meant that the ship was not fit for convoy escort duties, and Ambuscade was assigned target duties. In late 1942, Ambuscade became a trials ship for anti-submarine weapons and sensors, being fitted with the experimental 'Parsnip' anti-submarine mortar in an attempt to provide a more capable ahead-firing anti-submarine weapon than 'Hedgehog'. 'Parsnip' was not a success, and in May 1943, Ambuscade was fitted with the prototype installation of the 'Squid' anti-submarine mortar and its associated depth-finding Type 147 sonar. Trials of Squid were successful, and the weapon was widely fitted in new construction Royal Navy escorts. Ambuscade continued in use as a trials and training platform until the end of the war in Europe, then going into reserve. Ambuscade was used for shock trials during 1946, and was sold for scrapping in November that year, being broken up by West of Scotland Shipbreaking Company at Troon from March 1947. Export variant Ambuscade served as the basis for the design by Yarrow of the s which served the Portuguese Navy (Marinha Portuguesa) from 1933 to 1967. Five vessels were ordered by Portugal in 1932. The first two, NRP Douro and Tejo, which were laid down on 9 June 1932, were sold to the Colombian Navy before their 1933 completion. This was in response to the Colombia–Peru War. Renamed and Caldas respectively, they served the Colombians as the . Two further ships