About Birdsong Season 1, Episode 2 :

Stephen recovers from his injuries but he is still haunted by memories of his affair with Isabelle. Stephen ends up unexpectedly meeting Isabelle again as he and his men prepare for a major offensive at The Somme The battle is devastating and in the months that follow, Stephen starts to find some comfort in his friendship with Jack Firebrace. After Isabelle's sister Jeanne admits the secret which Isabelle had kept hidden from him, Stephen starts to believe that there really is a future worth fighting for.