"Operation Undergo was the 3rd Canadian Infantry Division's operation to take the fortified French port of Calais in September 1944. A subsidiary operation was executed to silence and capture the heavy batteries at Cap Gris Nez, which threatened the sea approaches to Boulogne."@en . . . "Canada" . "Operation Undergo"@en . . . "7,500 in Calais" . "1944-10-01Z"^^ . "Allied victory" . . . "approx. 260" .