1939-1945 20esiècle 20thcentury atlantiquenord campagnesetbatailles campaigns canada canadian convois(marine) german golfedu guerremondiale gulfof histoire history marinemarchande merchantmarine navalconvoys navaloperations naviresdeguerre northatlanticocean opérationsnavalesallemandes personalnarratives récitspersonnelscanadiens saint-laurent saintlawrence warships worldwar