Researching all the information relating to a courts martial can be complex. Minimum information required for finding courts martial records are the date the case was heard and the name of the accused. Most records are organised chronologically. Many hearings took place some time after an actual offence was committed.
Records of the courts martial commence around 1680 and the content of records varies from a brief summary of the case to full transcripts and minutes. Some records from the mid-nineteenth century to the early twentieth century have not survived. As you research the case papers, you may also find other records filed with the case including the service record of the accused, other official documents used as evidence such as casualty lists, extracts from ships' logbooks and warrant officer accounts.
Indexes and finding aids
Many of the official courts martial records are found within Admiralty digests in series ADM1. If you do not have a date for the hearing, it may be possible to find the reference for the case by entering the name of the accused and the key words “courts martial” in Discovery and restricting your advanced search to ADM1. Not all cases are individually listed so you may have to revert to other finding aids and indexes available.
Indexes to series ADM1 are found in series ADM12 which enables the date to be located. Use the register in ADM12 arranged by initial letter of the surname or the ships' name. Once you locate the name with a suffix of CM (courts martial) or the subseries “Ct Mar” then you can use the reference to find the actual files in series ADM1.
Registers – lists of trials
Series ADM 194 consists of the Courts Martial Registers covering the period 1812-1978 and cover courts martial only for Portsmouth and Plymouth Divisions. Some records in series ADM13 also contain registers of courts martial of Royal Naval officers and ratings between 1812 and 1815 and Royal Naval officers and warrant officers between 1857 and 1915. Some appear to overlap with those in series ADM194.
In these registers you should find brief details of the trials arranged chronologically and including the number of the courts martial, date of the trial, name, rank, ship of service at the date of trial, nature of the charge/s, whether proved or not and details of the sentence imposed or the acquittal.
Courts martial papers
Series ADM1 contains the records of courts martial covering 1680 - 1839 and 1845 -1910. For whatever reason there are no records covering 1840 to 1844. The records comprise minutes of proceedings and the sentences of courts martial held both at home and abroad. Most records are handwritten documents of around ten pages depending upon the complexity of the case. Some are written using shorthand.
For some reason records have been extracted from ADM1 specifically pieces 116, 137 and 167 covering 1890-1965 and are now included in series ADM156. They relate to records of courts martial of officers and those for personnel in the Royal Naval Reserve and other auxiliary divisions.
Naval Courts Martial and Boards of Enquiry Reports of a sensitive nature for the period 1892-1951 can be located in series ADM178 but may be subject to access restrictions in some instances.
There are also other series which include papers relating to navy courts martial outside the main series and not always indexed. Registers and returns of cases conducted on the Nore Station (Chatham) between 1848 and 1863 are in series ADM153 and those for the Mediterranean station between 1863 and 1874 are in series ADM121
Marshalsea prison Admiralty side
Within the Marshalsea prison in Southwark, most noted as a debtors' prison, there was an Admiralty side which housed those navy personnel sentenced to imprisonment under Royal Navy courts martial for mutiny, desertion, piracy, and what was referred to as "unnatural crimes". The premises occupied by the Admiralty were part of the old borough gaol. Because of the state of the cells and the attempted and successful breakouts of naval prisoners, they were often housed in the infirmary which was more secure. The naval prisoners were supposed to have a separate exercise yard in order to prevent criminal and debtor prisoners from associating with each other but layout plans for Marshalsea suggest that this may not have been the case.
The records for these Admiralty prisoners for the period 1773 to 1843 are maintained in separate admission and discharge records found in series PRIS11. The records give details of the man, his quality, age, details of the crime/charges, where and on what date the court martial was held, the terms of the sentence and when and under what conditions the discharge took place.
Digests of convictions (black books)
The digests or black books cover the period 1741 to 1815 and consist of three volumes of digests of convictions of officers at courts martial. They are in series ADM12/27 suffixed by the letters B-D and are arranged chronologically. They are indexed by initial letter of the surname. The information is in summary format and only provides date of the courts martial, brief outline of the charge and details of the sentence. A similar document for warrant officers covering the same period can be found in ADM11.
Although not directly concerned with matters of the courts martial, the High Court of Admiralty (Admiralty Sessions) does contain some records relating to courts martial, between 1802 and 1857, namely warrants for the arrest and imprisonment of both officers and ratings in regard to breaches of either naval or criminal law and can be located in a warrant entry book which cover the period 1811 to 1857 in series HCA55.