Secret Army - Season 3 - Eps 9: Sound of Thunder
The Allied advance continues as they at last enter Belgium, and the Germans begin to plan a strategic withdrawal from Brussels. Albert is petitioning for his release from prison, while Bradley endeavours to forge links with other resistance groups. The people of Brussels are now left to their own devices, and recriminations are brewing for collaborators and black marketeers. Kessler comes to help Madeleine, while Alain offers Monique and Natalie a place to hide. Meanwhile, Reinhardt at last obtains proof that the Candide is Lifeline’s base of operations, and prepares to strike.
About Secret Army

Title: Secret Army
First Air Date: 1977-09-07
Last Air Date: 1979-12-22
Status: Ended
Rating: 7.455/10 (from 11 votes)
Language: EN
Seasons: 4
Total Episodes: 43
Network: BBC One
Genres: Drama, War & Politics
Production Companies: BBC, Belgische Radio en Televisie
Synopsis
World War II drama about covert organisation Lifeline helping allied airmen escape after being shot down in occupied Europe, working with the Resistance and hiding from the Gestapo.
Cast

Bernard Hepton
Albert Foiret

Angela Richards
Monique Duchamps

Clifford Rose
Sturmbannführer Ludwig Kessler

Juliet Hammond-Hill
Natalie Chantrens