Definition
Breach of prison is the common law offense of unlawfully breaking out of or escaping from a jail, prison, or other lawful custody. The term encompasses two related but historically distinct acts: (1) the physical, forcible breaking of a prison or gaol with intent to escape, and (2) the unauthorized departure from lawful custody more broadly, including escape without physical force. At common law, breach of prison was classified as a misdemeanor, regardless of the nature of the underlying charge for which the person was confined.
The term should be understood as covering any unlawful departure from lawful confinement — not merely dramatic wall-breaking, but any act by which a confined person removes themselves from lawful custody without authorization.
Common Confusion
Breach of prison and escape are related but not identical in their historical usage. Breach of prison historically implied a forcible, physical breaking — an actual breach of the structure of confinement. Escape, by contrast, could occur without force, as when a prisoner simply walked away from a negligent guard or an unlocked door. Bouvier's entry defines breach of prison as an unlawful escape broadly, while Black's and Burrill's emphasize the forcible element. Modern statutes have largely collapsed this distinction, consolidating both concepts under "escape" or "escape from custody" provisions. Researchers encountering either term in historical sources should not assume they are interchangeable without examining the specific context.
Why It Matters in Research
Researchers will encounter this term almost exclusively in historical sources. Modern American and English criminal codes have replaced breach of prison with statutory offenses variously titled "escape," "escape from custody," "prison breach," or "unlawful departure from confinement." The conduct is the same; the label has changed.
Several traps await the historical researcher. First, the term's scope was contested even among classical authorities: some required actual physical force against the prison structure, while others extended it to any unauthorized departure. The offense charged in a historical indictment may therefore reflect local usage rather than doctrinal precision. Second, the severity of punishment at common law varied by the nature of the original charge — escape from custody on a felony charge was treated more harshly than escape on a misdemeanor charge, a distinction that affects how records catalog the offense. Third, Rapalje & Lawrence redirect the reader to the entry for PRISON, signaling that the term was already being absorbed into the broader prison-law framework by the late nineteenth century.
For corpus navigation: do not assume that a document using "breach of prison" and one using "escape" are describing the same legal charge in the same jurisdiction at the same time. Cross-reference against the date, jurisdiction, and the nature of the underlying confinement when building research chains.
The matching encyclopedia entries for breach (of contract) in the Law Mind Contracts Encyclopedia are not relevant to this term; the shared word "breach" is coincidental. Those entries address contractual breach in an entirely separate doctrinal domain.
Historical Dictionary Support
The four shelf sources agree on the core: breach of prison is a common law misdemeanor involving unlawful departure from custody. Black's and Burrill's are nearly identical in language, both citing Chitty's edition of Blackstone (4 Chitt. Bl. Com. 130) and Stephen's Commentaries (4 Steph. Com. 255), the two standard nineteenth-century syntheses of English criminal law. This convergence reflects a settled doctrinal baseline.
Bouvier diverges slightly in emphasis, defining the offense as an "unlawful escape out of prison" without requiring the forcible element, and citing Russell on Crimes. This looser formulation is consistent with Bouvier's generally broader treatment of criminal terms and may reflect the American tendency to treat escape and breach of prison as equivalent.
Rapalje & Lawrence's cross-reference to PRISON without independent definition suggests the compilers viewed the term as sufficiently absorbed into the general law of prison and escape that a standalone entry was unnecessary — a useful signal about where the doctrine stood by the 1880s.
None of the historical dictionaries address modern statutory equivalents, which is expected given their dates. None addresses the treatment of breach of prison in American jurisdictions specifically, making them unreliable guides to colonial or early republic practice without corroborating primary sources.
Jurisdictional Note
Modern American jurisdictions do not recognize breach of prison as a standalone statutory offense. The conduct is prosecuted under escape statutes, which vary by state in their treatment of force, the nature of the underlying custody, and gradations of severity. English law similarly absorbed breach of prison into statutory escape provisions. Researchers working in pre-twentieth-century common law jurisdictions should consult the jurisdiction's specific indictment forms and court records rather than relying on dictionary definitions alone.