The Castle Forbes was built at Aberdeen in 1818.  This was the second of two voyages bringing convicts to Australia, the first being in 1820.
Prisoners embarked on the Castle Forbes in 1823 came from counties in Ireland - Cork, Limerick, Antrim, Galway, Tipperary, Kerry, Waterford, Londonderry, Meath, Clonmel, Dublin, Carlow, Down, Cavan, Lough, Westmeath, Belfast, Leitrim, Sligo, Donegal, Longford, Kildare, King's Co., Mayo, Roscommon and Kilkenny. Two men were born in England in London and Cumberland.
They were mostly ploughman and reapers. Others gave their occupations as blacksmith, clerk, groom, bargeman, butcher, porter, glass cutter, fisherman, shoemaker, stone setter, tailor, weaver, gardener, footman, carter, cotton spinner, stocking hoser, sailor, soldier and an artillery man.
Their crimes were not recorded in the convict indents, however some had been convicted of offences under the Insurrection Act.....
Limerick 5th July 1823...The following were convicted on the clearest of evidence....James Keefe, from the county Cork and could not account why he was found at Cappa, where several outrages have been committed. Edmond Burke and Edmond James Burke, for tendering an unlawful oath to Edmond McNamara, of Clonoul, near Cappa, whose house was since consumed by the insurgents. Patrick Nash, Thomas Nash, John Kilroy, Michael Hartney, John Fitzgerald, and Thomas Carmody, for being absent from their dwellings.
It appeared in evidence, that they were concerned in attacking John King's house at Ballyalline, on the 17th May and cruelly flogging the inmates and destroying their furniture. The foregoing were sentenced to seven years transportation and were instantly dispatched on their route to Cork, attended by the bitter lamentations of their friends. 
The Castle Forbes departed Cork 28th September 1823.
The Guard comprised a detachment of the 40th under orders of Lieut. John Richardson which including the women and children amounted to 56 persons. Lieutenant-Colonel William Balfour of the 40th regiment also arrived on the Castle Forbes. The 40th regiment had been serving in Ireland.
Early in March 1823, the commanding officer, Lieutenant-Colonel Thornton received an intimation that it was intended to send the regiment to New South Wales. In the meantime it was ordered to proceed to Dublin, thence by sea to Liverpool, and after that by road to Chatham, in order to form guards for convict ships when required.;
The head quarters reached Dublin on 15th March and occupied the Royal Barracks. On the 30th the whole regiment embarked at Pigeon House, in eight small vessels, and reached Liverpool the following day.
A twenty eight days' march, including three Sundays, brought the regiment to Chatham. The Regiment marched in three divisions; the first arrived at Chatham on 21st April; the second, consisting of two companies, halted, and remained at Deptford; and the 3rd reached Chatham on 23rd April.
During the next year the 40th was sent out, in small detachments, as guards on board convict ships to Australia. This was after several years' rough service in Ireland, and but a short period of rest in England........
Embarked 25th April 1823 on ship Albion. Lieutenant Lowe
Embarked 5th July 1823 on ship Asia Captain Bishop
Embarked 10th July 1823 on ship Isabella. Lieutenant Millar
Embarked 18th July 1823 on ship Sir Godfrey Wilestoe. Captain Hibbert
Embarked 29 July 1823 on ship Guildford. Captain Thornhill
Embarked 31st July 1823 on ship Medina. Lieutenant Ganning
Embarked 5 August 1823 on ship Castle Forbes Lt.- Col. Balfour
Embarked 29 December 1823 on ship Prince Regent. Captain Stewart
Embarked 5th February 1824 on ship Chapman. Captain Jebb
Embarked 25 February 1824 on ship Countess of Harcourt. Captain Morow
Embarked 14 June 1824 on ship Mangles. Lt.- Col Thornton
Embarked 14 June 1824 on ship Princess Charlotte. Lieut Neilley
Other ships bringing detachments of the 40th regiment included the Minerva and Ann and Amelia.
Surgeon Matthew Anderson
Matthew Anderson kept a Medical Journal from 29 July 1823 to 19 January 1824. The chief cause of illness amongst the convicts was diarrhoea and dysentery. There were a few cases of scurvy which the surgeon treated with lemon Juice and sugar. 
Soldiers and prisoners mentioned in the surgeon's journal included:
James Kinsella - soldier of 40th regt.,
Joseph Smith - convict age 38
John Mackin - convict aged 16
John Quinn - convict aged 53
Howell Evans - soldier of 40th regt., aged 37
William Moore - soldier of 40th regt., aged 21
Patrick Corcoran - convict aged 17
Edward Bourke - convict aged 37
Andrew Murphy - convict aged 60
Patrick Harrington - convict aged 58
John Mulligan - convict aged 30
Martin Cavenagh - convict aged 21
Michael Kearney - convict aged 28
Richard Ambrose - convict aged 48
Thady Coffee - convict aged 26
John Finucane - soldier of the 40th regt., aged 21
Robert Johnson - convict aged 43
John Menane - convict aged 29
John Cokeley - convict boy
Daniel McCartey - convict aged 23
James Lamb - convict aged 52
Daniel Donovan - convict aged 32
Patrick Riley - convict aged 25
James Monaghan - convict aged 24
Matthew Anderson was also surgeon on the Surry in 1819, Mangles in 1820 and the Mangles in 1822
The Castle Forbes arrived in Port Jackson on 15th January 1824. A Muster was held on board on 17th January 1824 by Colonial Secretary Frederick Goulburn. The indents record the name of convict, occupation, when and where tried, sentence, age, native place, physical description, remarks as to behaviour on the voyage out and where and to whom assigned on arrival. One man Andrew Murphy was sent to hospital on shore on the ship's arrival in Port Jackson.
One hundred and thirty-nine male prisoners were landed, one prisoner having died on the passage - Martin Cavenagh had been severely beaten while in the Depot at Cork which the surgeon considered contributed to his death.
There are notes in the indents regarding some of those who died in the years soon after arrival. -
Samuel Bell - died in Parramatta Hospital in 1835
Martin Brian died at Moreton Bay 11 March 1830
Michael Dunn died at Moreton Bay 4 May 1830
James Hacket died in Sydney Hospital 9 November 1825.
The conduct of prisoners during the voyage was mostly very good, however there were some who were referred to as idle -
Others such as Patrick Fields, Walter Hall, John Mackin, Patrick Molloy were referred as behaving badly or very badly.
Thomas Shanahan was described as riotous and Patrick Lenaghan as quarrelsome.
John McCaw a former solder of the 80th regiment was considered a very useful man.
On arrival many prisoners were assigned to private service straight from the ship. Others were sent to Hyde Park Barracks or to Liverpool, Windsor and Bathurst districts for re-distribution. The younger prisoners were transferred to Carter's Barracks.
Notes and Links
1). Convict Michael Halpin was on a Colonial Office list of thirteen people who applied for their families sent to New South Wales
2). Find about bushranger Patrick Riley, convict on the Castle Forbes
6). Return of Convicts of the Castle Forbes assigned between 1st January 1832 and 31st March 1832 (Sydney Gazette 5 July 1832)..... Edward Reardon. Indoor servant assigned to Henry Drinkwater at Sydney