Question: When did Charles Sackville-West, 6Th Earl De La Warr's father die?

Knowledge 1: Charles Sackville-West, 6th Earl De La Warr
Major-General Charles Richard Sackville-West, 6th Earl De La Warr (13 November 1815 – 23 April 1873), styled Lord West between 1850 and 1869, was a British soldier.Sackville-West was the second son of George Sackville-West, 5th Earl De La Warr, and Lady Elizabeth Sackville, daughter of John Sackville, 3rd Duke of Dorset.He was the brother of George West, Viscount Cantelupe, Reginald Sackville, 7th Earl De La Warr, Elizabeth Russell, Duchess of Bedford, Mortimer Sackville-West, 1st Baron Sackville, and Lionel Sackville-West,2nd Baron Sackville.He was educated at Harrow.Sackville-West served in the British Army and was appointed aide-de-camp and military secretary to Sir Hugh Gough in India in 1845.He fought at the Battle of Sobraon in 1846 during the First Anglo-Sikh War.In 1850 he became known by the courtesy title Lord West after the death of his elder brother, Lord Cantelupe.Promoted to major in 1852 and to lieutenant-colonel in 1855, he served in the Crimean War.He was appointed a Companion of the Order of the Bath in 1855 and an Officer of the Legion of Honour in 1856 and awarded the Order of the Medjidie in 1858.In 1864 he was promoted to major-general.He succeeded his father in the earldom in 1869.In 1871 he was made a Knight Commander of the Order of the Bath (KCB).Lord De La Warr died in April 1873, aged 57, by drowning himself in the River Cam.He was unmarried and was succeeded in the earldom by his younger brother, Reginald, Lord Buckhurst. [SEP] Knowledge 2: George Sackville-West, 5th Earl De La Warr
George John Sackville-West, 5th Earl de la Warr, PC (26 October 1791 – 23 February 1869), styled Viscount Cantelupe until 1795, was a British courtier and Tory politician.
Knowledge 1: Charles Sackville-West, 6th Earl De La Warr
Major-General Charles Richard Sackville-West, 6th Earl De La Warr (13 November 1815 – 23 April 1873), styled Lord West between 1850 and 1869, was a British soldier.Sackville-West was the second son of George Sackville-West, 5th Earl De La Warr, and Lady Elizabeth Sackville, daughter of John Sackville, 3rd Duke of Dorset.He was the brother of George West, Viscount Cantelupe, Reginald Sackville, 7th Earl De La Warr, Elizabeth Russell, Duchess of Bedford, Mortimer Sackville-West, 1st Baron Sackville, and Lionel Sackville-West,2nd Baron Sackville.He was educated at Harrow.Sackville-West served in the British Army and was appointed aide-de-camp and military secretary to Sir Hugh Gough in India in 1845.He fought at the Battle of Sobraon in 1846 during the First Anglo-Sikh War.In 1850 he became known by the courtesy title Lord West after the death of his elder brother, Lord Cantelupe.Promoted to major in 1852 and to lieutenant-colonel in 1855, he served in the Crimean War.He was appointed a Companion of the Order of the Bath in 1855 and an Officer of the Legion of Honour in 1856 and awarded the Order of the Medjidie in 1858.In 1864 he was promoted to major-general.He succeeded his father in the earldom in 1869.In 1871 he was made a Knight Commander of the Order of the Bath (KCB).Lord De La Warr died in April 1873, aged 57, by drowning himself in the River Cam.He was unmarried and was succeeded in the earldom by his younger brother, Reginald, Lord Buckhurst. [SEP] Knowledge 2: William Sackville, 10th Earl De La Warr
William Herbrand Sackville, 10th Earl De La Warr (16 October 1921 – 9 February 1988) was a British peer.He inherited the earldom on 28 January 1976 on the death of his father Herbrand Edward Dundonald Brassey Sackville, 9th Earl De La Warr.Earl De La Warr was educated at Eton College, and fought in World War II, attaining the rank of Captain in the Parachute Regiment of the British Army.After the war, on 18 May 1946, he married Anne Rachel Devas (grandniece of a former Prime Minister, Sir Henry Campbell-Bannerman).They had three children:In the autumn of 1987, the earl offered to sell Ashdown Forest, the real-life setting of the Winnie-the-Pooh stories, to the East Sussex County Council at a below-market price of £1.2 million for the 6,500 acre property.As young children, the future earl and Christopher Robin Milne had played together there.Milne himself joined conservationists to prevent the forest from being sold piecemeal to private owners, and to oppose an application by BP to drill for oil there.The sale to the county council was concluded after the earl's death, making the forest public land.On 9 February 1988, at age 66, Earl De La Warr died after falling under a train at the St. James's Park station of the London Underground.An inquest ruled the death to be a suicide, with a jury finding that the earl had been "anxious and upset over hurricane damage to his estate."
Knowledge 1: George Sackville-West, 5th Earl De La Warr
George John Sackville-West, 5th Earl de la Warr, PC (26 October 1791 – 23 February 1869), styled Viscount Cantelupe until 1795, was a British courtier and Tory politician. [SEP] Knowledge 2: William Sackville, 10th Earl De La Warr
William Herbrand Sackville, 10th Earl De La Warr (16 October 1921 – 9 February 1988) was a British peer.He inherited the earldom on 28 January 1976 on the death of his father Herbrand Edward Dundonald Brassey Sackville, 9th Earl De La Warr.Earl De La Warr was educated at Eton College, and fought in World War II, attaining the rank of Captain in the Parachute Regiment of the British Army.After the war, on 18 May 1946, he married Anne Rachel Devas (grandniece of a former Prime Minister, Sir Henry Campbell-Bannerman).They had three children:In the autumn of 1987, the earl offered to sell Ashdown Forest, the real-life setting of the Winnie-the-Pooh stories, to the East Sussex County Council at a below-market price of £1.2 million for the 6,500 acre property.As young children, the future earl and Christopher Robin Milne had played together there.Milne himself joined conservationists to prevent the forest from being sold piecemeal to private owners, and to oppose an application by BP to drill for oil there.The sale to the county council was concluded after the earl's death, making the forest public land.On 9 February 1988, at age 66, Earl De La Warr died after falling under a train at the St. James's Park station of the London Underground.An inquest ruled the death to be a suicide, with a jury finding that the earl had been "anxious and upset over hurricane damage to his estate."

Answer: 23 February 1869