O'Brien's second biography of British Prime Minister David Lloyd George's wife Margaret serves as a prequel to his first volume, The Campaigns of Margaret Lloyd George: The Wife of the Prime Minister 1916-1922 (Y Lolfa, 2022), which focused on her campaigns during the 1918-1922 peacetime Coalition Government led by her husband. Similarly based on research in the unpublished archive of letters and speeches belonging to his grandfather the Revd. J T Rhys, former private secretary to Margaret Lloyd George at 10 Downing St, this book describes her six major campaigns during WWI: for her Welsh Troops Fund; the British & Foreign Sailors' Society; Welsh Army recruitment; Food & Home Economy; Temperance; Health & Social Welfare. It also looks at her ongoing campaigning for opportunities for women, for churches, and for Wales.