▁decided ▁to ▁keep ▁it , ▁as ▁it ▁raised ▁a ▁laugh ▁with ▁all ▁who ▁saw ▁it , ▁and ▁the ▁crew ▁adopted ▁the ▁s log an ▁as ▁a ▁war - c ry ; ▁U - 6 9 ▁there after ▁became ▁known ▁as ▁the ▁" la ughing ▁cow ". ▁ ▁Wolf pack s ▁U - 6 9 ▁took ▁part ▁in ▁seven ▁w olf pack s , ▁namely ▁ ▁Se ew olf ▁( 4 – 1 5 ▁September ▁ 1 9 4 1 ) ▁ ▁Brandenburg ▁( 1 5 – 2 4 ▁September ▁ 1 9 4 1 ) ▁ ▁St ör te be cker ▁( 5 – 1 9 ▁November ▁ 1 9 4 1 ) ▁ ▁Gö de cke ▁( 1 9 – 2 5 ▁November ▁ 1 9 4 1 ) ▁ ▁Let zte ▁Ritter ▁( 2 5 ▁November ▁– ▁ 3 ▁December ▁ 1 9 4 1 ) ▁ ▁Fal ke ▁( 8 – 1 9 ▁January ▁ 1 9 4 3 ) ▁ ▁H au de gen ▁( 1 9 ▁January ▁– ▁ 1 5 ▁February ▁ 1 9 4 3 ) ▁ ▁Sum mary ▁of ▁ra iding ▁history ▁ ▁References ▁ ▁Bibli ography ▁ ▁External ▁links ▁ ▁Category : G erman ▁Type ▁VII C ▁sub mar ines ▁Category : World ▁War ▁II ▁sub mar ines ▁of ▁Germany ▁Category : Sh ips ▁built ▁in ▁K iel ▁Category : 1 9 4 0 ▁ships ▁Category : U - bo ats ▁commission ed ▁in ▁ 1 9 4 0 ▁Category : U - bo