On 3 November 1801, together with five other men, during a storm at the Roads of Copenhagen, Bache managed to rescue the crew from a capsized Flensburg brig.
The wholesale merchant Hans Staal Hagen, who had spotted the desperate situation, had promised a reward of 100 Danish rigsdaler to whoever could save them.
The king awarded him a medal Pro meritis, Grosserer-Societetet presented him with a silver cup, Adam Oehlenschläger honoured him with a poem, and Frederik Høegh-Guldberg also mentions him in his writings.
On 10 November in the same year he obtained a letter of mark for his ferry boat Makrelen, with which he and a select crew targeted British merchant shipping.
Lars Bache's body drifted ashore on 7 August 1809 on Vemmetofte foreshore.