 During the month-long campaign, "U-6"s sister boats suffered numerous losses, and gained a reputation as something of a liability, which led them to be withdrawn to a training squadron in the Baltic for the remainder of the war.In the Baltic, "U-6" trained officer cadets in the skills needed to fight in the Battle of the Atlantic.Some of her patrols even verged on Soviet territory following Operation Barbarossa but, unlike some of her sister boats, "U-6" never found a target on these missions.