Definition
Capture has two primary legal meanings, one rooted in international law and one in property law.
1. International Law (Belligerent Capture). The taking of enemy property by a belligerent power during wartime. Capture in this sense is a recognized mode of acquiring title to movable property — including ships, cargo, and military stores — through the exercise of military force. Property taken on land is called booty; property taken at sea is called prize. The validity of a capture generally requires that the property be taken by an open enemy or under recognized reprisals, that the captor intend to deprive the owner of it, and that the taking be accomplished by superior force rather than mere accident or abandonment. Goods drifting from a wreck, for example, do not constitute capture and cannot be appropriated by a finder under this doctrine.
2. Property Law (Rule of Capture). A principle of property acquisition providing that ownership of a fugitive or unowned resource — wild animals, percolating groundwater, oil, and gas — vests in the person who first reduces it to possession. The rule rewards the first possessor and generally bars the original owner from recovering a resource that has escaped, migrated, or been drawn away by a neighbor's lawful activity. In natural resources law, this is the dominant rule governing subsurface oil and gas: a landowner who drills a legal well acquires title to whatever petroleum flows to the wellhead, even if that petroleum migrated from beneath a neighbor's land.
Common Language
Modern common usage (Wiktionary): An act of capturing; seizing by force or stratagem. Also, something that has been captured; a captive. In modern usage, capture extends to digital recording or storage of information.
Historical common usage (Webster's 1913): The act of seizing by force or getting possession by superior power or stratagem, as of an enemy, vessel, or criminal. Also the thing so taken — a prize or prey.
The ordinary meaning tracks the international law sense closely enough that no gap exists there. The gap lies in the property law usage: a landowner who applies no force and commits no wrong can "capture" oil or water simply by drilling or pumping — an act of economic exploitation, not seizure. The property rule of capture has no intuitive connection to the everyday meaning of the word and can mislead researchers who encounter it without context.
Common Confusion
Capture vs. Seizure. In international and civil law, these terms are systematically distinguished: capture is a taking by military or belligerent power; seizure is a taking by civil authority. A customs officer seizes contraband; a warship captures a prize. Black's and Bouvier's both flag this distinction explicitly, and it has procedural consequences — prize courts, not ordinary civil courts, adjudicate disputes over belligerent captures. Researchers encountering either term in historical sources should not treat them as interchangeable.
Capture vs. Confiscation. Capture operates between belligerents during active hostilities and vests title in the captor subject to prize adjudication. Confiscation is a domestic sovereign act, typically against enemy-owned property within the confiscating state's jurisdiction. The two procedures, and the legal consequences for third-party claimants, differ substantially.
Recognized Forms
/SUBTYPES
Belligerent Capture (International Law): Taking of enemy ships or goods at sea (prize) or on land (booty) during declared or recognized warfare.
Capture of Wild Animals (Ferae Naturae): Acquisition of property rights in wild animals through physical possession — either qualified ownership by confinement or absolute ownership by killing. The first possessor acquires title; a previously captured animal that escapes and loses memory of captivity reverts to the common.
Rule of Capture (Natural Resources): The property principle applied to oil, gas, and percolating water, under which the first person to produce the resource to the surface acquires title, regardless of subsurface migration from a neighbor's land. Statutory pooling and unitization schemes exist in most producing states precisely to modify or limit this rule's wasteful tendencies.
Why It Matters in Research
The two legal meanings of capture — belligerent taking and property acquisition — appear in entirely different areas of the corpus and should not be confused when tracking citations or doctrine.
In international law sources, the treatment of capture evolved substantially across the 19th century. Earlier materials (Burrill, Bouvier) reflect a stricter rule requiring formal warfare and intent to deprive; later materials engage with prize court procedures and the treatment of neutral cargo aboard enemy vessels. Researchers working in Civil War-era materials will encounter the prize jurisdiction of federal courts extensively — the Anderson's Dictionary entries on cepit and related terms are traces of the older pleading vocabulary surrounding these actions.
In property law, the rule of capture is lightly treated in the historical dictionaries, which address it primarily in the context of wild animals. The application to oil and gas — now the dominant modern context — postdates Bouvier's, Burrill's, and Rapalje & Lawrence and is largely absent from those sources. Researchers who encounter "rule of capture" in 20th-century natural resources materials and then reach back to the historical dictionaries will find only the ferae naturae doctrine and must bridge that gap analytically.
The oil and gas rule of capture is also the entry point to understanding why pooling, unitization, and compulsory integration statutes were enacted. Without the rule of capture as background, these statutory schemes are opaque. The Law Mind Property Encyclopedia entry on oil and gas law addresses this directly.
Jurisdictional variation in the rule of capture (groundwater) is significant: some western states apply prior appropriation rather than capture, and even in capture states, statutory groundwater management districts may substantially restrict the common-law rule.
Historical Dictionary Support
The historical sources are in strong agreement on the international law definition. Black's (both editions), Bouvier's, and Burrill's all define capture as the taking of enemy property by a belligerent, and all distinguish it from seizure as a civil-authority concept. Burrill cites Blackstone and Kent, grounding the definition in the established common law of nations framework.
Rapalje & Lawrence adds useful texture on the land/sea distinction and on the internal distribution of booty among captors, material that Bouvier's and Burrill's treat more summarily. Bouvier's provides the most practically useful limitation: goods floating from a wreck are expressly excluded from capture, a point that appears in federal admiralty reporting and is worth noting for researchers working in maritime loss cases.
On wild animals, Rapalje & Lawrence provides the clearest treatment, drawing on Stephens' Commentaries for the proposition that killing vests absolute ownership while mere confinement vests only qualified ownership.
What the historical dictionaries miss almost entirely is the rule of capture as applied to subsurface minerals. This is a genuine gap in the corpus's older shelf sources and cannot be remedied by consulting them. Researchers must move to 20th-century treatises and the encyclopedia entry for adequate coverage.
Jurisdictional Note
The rule of capture for oil and gas remains the baseline common-law rule across major U.S. producing states, but virtually every producing state has overlaid it with statutory modifications — pooling orders, spacing rules, and unitization requirements — that substantially alter its practical operation. For groundwater, the jurisdictional split between eastern (reasonable use/capture) and western (prior appropriation) states is fundamental and must be identified before any research conclusion on water rights is reliable.
Encyclopedia Cross-Reference
Oil and Gas Law — Leasing, Royalties, Pooling, Unitization, and the Rule of Capture (Law Mind Property Law Encyclopedia)