This episode takes place in June 1916.
Daisy mistakenly mentions that Lord Kitchener was killed in the Battle of Jutland. First Earl Herbert Kitchener, an Irishman by birth, hero of the Battle of Ondurman, the Boer War, and World War I was killed when his ship struck a German mine near the Orkney Islands while headed to a conference with the Russians in 1915.
The upcoming major allied offensive mentioned in this episode is the disastrous Battle of tbe Somme.