The couple moved to Spain and joined the International Brigades at the outbreak of the Spanish Civil War in 1936.

[1] In a 2011 interview with El País, London described her involvement with the International Brigade as the "best moment" of her life, saying, "The Spanish people are always in my memories.

"[1] Lise and Artur moved to Paris in 1939 following the end of Spanish Civil War and the establishment of Francoist Spain.

In a 2011, interview with El País, London revealed that she had "tore up my membership card" and left the French Communist Party, though she remained a supporter of communism.

[1] Lise London died on 31 March 2012 in Paris at the age of 96 and was buried with her husband at Ivry Cemetery in Ivry-sur-Seine.