|Born||7 November 1867
Camden Park Estate, New South Wales
|Died||17 November 1946
Camden Park Estate, New South Wales
|Years of service||1892 – 1924|
|Commands held||Sea Transport Service
5th Battalion, Australian Commonwealth Horse
|Awards||Mentioned in Despatches|
|Other work||Member of the New South Wales Legislative Assembly
Member of the New South Wales Legislative Council
Major General Hon James William Macarthur-Onslow VD (7 November 1867 – 17 November 1946) was a soldier, grazier and politician. The son of a prominent New South Wales family, he was commissioned in the New South Wales Mounted Rifles in 1892 and served in the Chitral Expedition, Boer War and Great War. Afterwards he served in the New South Wales Legislative Assembly and New South Wales Legislative Council.
James William Macarthur-Onslow was born on 7 November 1867 at Camden Park Estate, near Menangle, New South Wales, the son of Captain Arthur Alexander Walton Onslow and his wife Elizabeth née Macarthur, the granddaughter of wool pioneer John Macarthur. He was educated at Sydney Grammar School. His father died in 1882 and in 1887 his mother took her children to the United Kingdom to complete their education while she studied dairy farming. Macarthur-Onslow read law at Trinity College, Cambridge, receiving Bachelor of Arts (BA) and Bachelor of Laws (LLB) degrees in 1890. He returned to Australia in 1891. He married Enid Emma Macarthur, the granddaughter of Hannibal Hawkins Macarthur in 1897. - James' great-grandfather and Enid's great-grandfather were brothers.
Macarthur-Onslow was commissioned captain of the Camden Squadron of the New South Wales Mounted Rifles in 1892. In 1894 he was selected by commandant of the military forces in New South Wales, Colonel Edward Hutton, for training in India with the 11th Hussars, the Royal Artillery, and the 1st Battalion, King's Royal Rifle Corps of the British Army. He served in India from 1894 to 1895, seeing active service in the Chitral Expedition.
In 1900 he made his own way to South Africa in 1900 to participate in the Boer War, where he served as aide-de-camp to Hutton, who was now a major general. He participated in operations in the Orange Free State from February to May 1900, including the actions at Vet River and Zand River, and operations in the Transvaal from May to November 1900. For this service, he was mentioned in despatches by Field Marshal Lord Roberts. He returned to Australia in March 1901, but was later appointed to command the 5th Battalion, Australian Commonwealth Horse.
He served as aide-de-camp to the Governor-General of Australia, the Earl of Hopetoun in 1902. He commanded the 2nd Light Horse Regiment from July 1903 until December 1907 when he was promoted to colonel on assuming command of the 1st Light Horse Brigade. He was on the unattached list in January 1910. Although too old for active service during the Great War, Macarthur-Onslow held the rank of Colonel with the Sea Transport Service of the First Australian Imperial Force, commanding troop ships travelling between Australia, the Middle East and Britain between 1915 and 1917. He was aide-de-camp to the Governor-General a second time from 1917 to 1920. He retired with the rank of major general in 1924.
Macarthur-Onslow served the people of New South Wales as a member of the New South Wales Legislative Assembly, representing the seats of Waverley from 1907 to 1913, Bondi from 1913 to 1920, and Eastern Suburbs from 1920 to 1922. He was nominated to the New South Wales Legislative Council in 1922, then a lifetime appointment, and served there until 1933, but was largely inactive.
Macarthur-Onslow served as a director of The Commercial Banking Company of Sydney Limited and The Colonial Sugar Refining Company Limited. His other appointments included president of the Australian Club and director of the Royal Prince Alfred Hospital 1909 until 1929.
A small selection of other notable family members includes:
- Captain Arthur Alexander Walton Onslow (1833–1882) - father
- Arthur Pooley Onslow - Arthur Alexander's father
- Rosa Roberta, née Macleay - Arthur Pooley Onslow's wife (married 1832) - Arthur Alexander's mother
- Alexander Macleay (1767–1848) - Rosa Roberta's father - Arthur Alexander's grandfather. Fathered 17 children, including:
- William Sharp Macleay (1792–1865) He never married and the heir to his estate was his brother, George W. J. Macleay
- Sir George Macleay (1809–1891)
- James Robert (1811–1892) secretary of the commission for the suppression of the slave trade in Cape Colony.
- Margaret (b. 1802) married Archibald Clunes Innes (1800–1857) in 1829
- Christiana Susan (b.1799) married Captain William Dumaresq (1793–1868) in 1830
- Barbara Isabella (b.1797) married Pieter Laurentz Campbell (1809–1948) in 1834.
- Sir William John Macleay (1820–1891) - Alexander Macleay's nephew
- Elizabeth née Macarthur (1840–1911) - mother
- Arthur and Elizabeth had 8 children: 6 boys and 2 girls - see siblings below
- She inherited the estates of her childless uncles Sir Edward and Sir William, and that of her father James.
- She changed her name to Macarthur-Onslow in 1892.
- James Macarthur (1798–1867) - Elizabeth's father
- John Macarthur (1767–1834) - Elizabeth's grandfather
- Elizabeth Macarthur (1766–1850) - John's wife. Their other children included:
- 1. Sir Edward Macarthur (1789–1872) Married Sarah 1862. Died childless.
- 3. John - lawyer - remained in England
- 4. James (1798–1867)
- 5. Sir William Macarthur (1800–1882) Died unmarried.
- Siblings (5 brothers, 2 sisters)
- James William Macarthur-Onslow (1867–1946)
- William died in WWI
- Emily Susan (1869-1876)
- Rosa Sibella Macarthur Onslow (1871–1943) Unmarried.
- Brigadier General George Macleay Macarthur-Onslow (1875–1931) - brother
- He had married at Manar, near Braidwood, Violet Marguerite Gordon on 16 October 1909. She and their daughter survived him.
- (Francis) Arthur Macarthur-Onslow (1879–1938) - brother (served in the South African War)
- He was survived by his wife Sylvia Seton Raymond, née Chisholm, whom he had married on 16 May 1903 at Goulburn, and by three sons and a daughter.
- Major General Sir Denzil Macarthur-Onslow - Arthur's eldest son
- Enid Emma Macarthur - wife
- John Macarthur was James Macarthur-Onslow's great-grandfather
- John's elder brother James was Enid's great-grandfather
- Hannibal Hawkins Macarthur - Enid's grandfather - John Macarthur's nephew
- Hannibal had 6 daughters and 5 sons
- 3. George Fairfowl Macarthur (1825–1890) 3 sons and 2 daughters
- James Arthur (b. 1898 d.1959) married Constance Herbert, disinherited and bankrupted by his father
- Helen Maud (b 1899 d.1968) married Major General Sir Reginald Stanham and inherited Camden Park
- Brigadier Richard Quentin Macarthur-Stanham - after her death it passed to her son
- Elizabeth Enid (b1903 d.1990) married Frederick Rothe
- "Onslow (post Macarthur-Onslow), James William Macarthur (ONSW887JW)". A Cambridge Alumni Database. University of Cambridge.
- Walsh, G. P. "Macarthur-Onslow, James William (1867 - 1946)". Australian Dictionary of Biography. Australian National University. Retrieved 28 September 2008.
- "B2455 ONSLOW James William Macarthur". National Archives of Australia. Retrieved 15 November 2009.
- The London Gazette: . 10 September 1901. Retrieved 15 November 2009. (Mentioned in Despatches - South Africa)
- "Major General James William Macarthur-Onslow (1867 - 1946)". Members of Parliament. Parliament of New South Wales. Retrieved 18 April 2007.
- Bede Nairn, 'Onslow, Arthur Alexander Walton (1833 - 1882)', Australian Dictionary of Biography, Volume 5, Melbourne University Press, 1974, pp. 369–370.
- E. K. Braybrooke, 'Onslow, Sir Alexander Campbell (1842 - 1908)', Australian Dictionary of Biography, Volume 5, Melbourne University Press, 1974, pp. 367–369.
- 'McLeay, Alexander (1767 - 1848)', Australian Dictionary of Biography, Volume 2, Melbourne University Press, 1967, pp. 177–180.
- David S. Macmillan, 'Macleay, William Sharp (1792 - 1865)', Australian Dictionary of Biography, Volume 2, Melbourne University Press, 1967, pp. 182–183.
- David S. Macmillan, 'Macleay, Sir George (1809 - 1891)', Australian Dictionary of Biography, Volume 2, Melbourne University Press, 1967, pp. 180–182.
- E. Flowers, 'Innes, Archibald Clunes (1800 - 1857)', Australian Dictionary of Biography, Volume 2, Melbourne University Press, 1967, pp. 3–4.
- Nancy Gray, 'Dumaresq, William John (1793 - 1868)', Australian Dictionary of Biography, Volume 1, Melbourne University Press, 1966, pp. 333–335.
- Hazel King, 'Campbell, Pieter Laurentz (1809 - 1848)', Australian Dictionary of Biography, Volume 1, Melbourne University Press, 1966, pp. 201–202.
- Michael Hoare, Martha Rutledge, 'Macleay, Sir William John (1820 - 1891)', Australian Dictionary of Biography, Volume 5, Melbourne University Press, 1974, pp. 185–187.
- J. D. Heydon, 'Macarthur, James (1798 - 1867)', Australian Dictionary of Biography, Volume 2, Melbourne University PresNs, 1967, pp. 149–153.
- Margaret Steven, 'Macarthur, John (1767 - 1834)', Australian Dictionary of Biography, Volume 2, Melbourne University Press, 1967, pp. 153–159.
- Jill Conway, 'Macarthur, Elizabeth (1766 - 1850)', Australian Dictionary of Biography, Volume 2, Melbourne University Press, 1967, pp. 144–147.
- A. J. Hill, 'Macarthur, Sir Edward (1789 - 1872)', Australian Dictionary of Biography, Volume 5, Melbourne University Press, 1974, pp. 122–123.
- Ruth Teale, 'Macarthur, Sir William (1800 - 1882)', Australian Dictionary of Biography, Volume 5, Melbourne University Press, 1974, pp. 124–125.
- Caroline Simpson, 'Macarthur Onslow, Rosa Sibella (1871 - 1943)', Australian Dictionary of Biography, Volume 10, Melbourne University Press, 1986, pp. 198–199.
- Bede Nairn, 'Macarthur, Hannibal Hawkins (1788 - 1861)', Australian Dictionary of Biography, Volume 2, Melbourne University Press, 1967, pp. 147–149.
- K. J. Cable, 'Macarthur, George Fairfowl (1825 - 1890)', Australian Dictionary of Biography, Volume 5, Melbourne University Press, 1974, pp. 123–124.
|Parliament of New South Wales|
|Member for Waverley
|Member for Bondi
|Member for Eastern Suburbs
Served alongside: Fingleton/Dwyer, Jaques, Oakes, O'Halloran