Operation Wellhit (the Battle of Boulogne) from 17 to 22 September 1944, was an operation of the Second World War by the 3rd Canadian Division of the First Canadian Army to take the fortified port of Boulogne in northern France. The 9th Canadian Infantry Brigade had hoped to take Boulogne off the march as it advanced up the coast but it was stopped by the German fortifications 5 mi (8.0 km) from the city.