They contain descriptions on the day-to-day running of the British war effort (including some quite indiscreet references to top secret interceptions of German radio traffic), Brooke's thoughts on strategy, as well as frequent anecdotes from the many meetings he had with the Allied leadership during the war.
Dagbøgerne indeholder beskrivelser af den daglige ledelse af den britiske krigsindsats (herunder nogle temmelig indiskrete henvisninger til tophemmelige opsnapninger af tysk radiokommunikation), Brookes tanker om strategi og jævnligt anekdoter fra de mange møder, Brooke havde med de allierede ledere under krigen.