At the beginning of the First World War, Lady Carnarvon opened a hospital for war wounded at Highclere Castle, helping with the organisation and assisting as a nurse. The hospital later moved to Mayfair in London. In 1919, Lady Carnarvon turned down the opportunity of being appointed a Commander of the Order of the British Empire for her war work. The Earl of Carnarvon developed an interest in Egyptology and became the financial backer of the search for Tutankhamun's tomb in the Valley of the Kings, Egypt, assisted by Almina's wealth. In November 1922, her husband and daughter were present with the archaeologist Howard Carterat the opening of the tomb. In March 1923, Lady Carnarvon travelled to Egypt to join her husband, who had developed pneumonia. He died on 5 April 1923, and Almina returned to Britain with his body later that month. She continued to provide financial support for Carter's excavation of the tomb until 1925, when she reached a settlement with the Egyptian authorities whereby she gave up any claim on the contents of the tomb in return for £36,000 compensation. The Carnarvons' only son, Henry Herbert, succeeded his father as sixth earl. Later in 1923, Almina married secondly Lieutenant-Colonel Ian Onslow Dennistoun. Almina Dennistoun died in 1969 in Bristol, at the age of 92.
In 1925, Almina Dennistoun was involved in a sensational High Court case, known as the "Bachelor's Case", between her husband, Colonel Dennistoun, and his former wife, Dorothy Dennistoun. When they had divorced, Dennistoun had been unable to pay ancillary relief and instead had promised he would provide for his ex-wife in the future, when he had funds. After hearing about Almina's wealth, Dorothy Dennistoun demanded the alimony she had been promised. Almina saw this as blackmail and persuaded her new husband to contest his former wife's claim in the courts, in what Sir Henry McCardie, who tried the case, called "the most bitterly conducted litigation I have ever known". A courtroom speech by Norman Birkett persuaded the jury to decide to disregard the agreement of Dennistoun to pay ancillary relief to his former wife.
Biographies
Carnarvon, Fiona, Countess of, Lady Almina and the Real Downton Abbey: The Lost Legacy of Highclere Castle
Cross, William, The Life and Secrets of Almina Carnarvon