St Nazaire Raid
She made three patrols in the Atlantic from her base in Germany and from St Nazaire in occupied France, and sank three ships. She briefly clashed with British forces on their way to the St Nazaire Raid in March 1942. In October "U-593" transferred to the Mediterranean and from various bases there made a further 13 patrols, sinking 8 merchant ships and 5 naval vessels, before being sunk in December 1943.