Four Canadian

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 naval units have been named HMCS Ottawa.
(I) was C class destroyer

C and D class destroyer

The C and D class was a group of 14 destroyers built for the Royal Navy in the early 1930s. As in previous years, it was originally intended to order a complete flotilla comprising eight destroyers—plus a flotilla leader as the ninth unit—in each year. However, only four ships—plus a leader—were...

 commissioned as in the Royal Navy

Royal Navy

The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 before serving with the Royal Canadian Navy

Royal Canadian Navy

The history of the Royal Canadian Navy goes back to 1910, when the naval force was created as the Naval Service of Canada and renamed a year later by King George V. The Royal Canadian Navy is one of the three environmental commands of the Canadian Forces...

 from 1938-1942.
(II) was G class destroyer

G and H class destroyer

The G- and H-class destroyers were a class of twenty-four destroyers of the Royal Navy launched in 1935–1939. They served in World War II and sixteen were lost, with a seventeenth being written off as a constructive total loss...

 commissioned as in the RN before serving with the RCN from 1943-1945.
(III) was St. Laurent class destroyer

St. Laurent class destroyer

The St. Laurent class destroyer was a class of destroyers that served the Royal Canadian Navy and later the Canadian Forces from the mid-1950s to the mid-1990s....

 that served in the RCN and Canadian Forces from 1956-1992.
(IV) is a Halifax class frigate

Halifax class frigate

The Halifax-class frigate is a class of multi-role patrol frigates that have served the Royal Canadian Navy since 1992...

 commissioned in 1996.

Battle honours

• Atlantic, 1939-45.
• Normandy, 1944.
• English Channel, 1944.
• Biscay, 1944.