WAn ensign is the national flag flown on a vessel to indicate nationality. The ensign is the largest flag, generally flown at the stern (rear) of the ship while in port. The naval ensign, used on warships, may be different from the civil ensign or the yacht ensign. Large versions of naval ensigns called battle ensigns are used when a warship goes into battle. The ensign differs from the jack, which is flown from a jackstaff at the bow of a vessel.
WA battle ensign is the name given to a large war ensign (flag) hoisted on a warship's mast just before going into battle.
WIn British maritime law and custom, an ensign is the identifying flag flown to designate a British ship, either military or civilian. Such flags display the United Kingdom Union Flag in the canton, with either a red, white or blue field, dependent on whether the vessel is civilian, naval, or in a special category. These are known as the red, white, and blue ensigns respectively.
WA French ensign is the flag flown at sea to identify a vessel as French. Several such ensigns have existed over the years as well as terrestrial flags based on the ensign motif.
WA maritime flag is a flag designated for use on ships, boats, and other watercraft. Naval flags are considered important at sea and the rules and regulations for the flying of flags are strictly enforced. The flag flown is related to the country of registration: so much so that the word "flag" is often used symbolically as a synonym for "country of registration".
WStriking the colors—meaning lowering the flag that signifies a ship's or garrison's allegiance—is a universally recognized indication of surrender, particularly for ships at sea. For a ship, surrender is dated from the time the ensign is struck.
WThe ensign of the United States is the flag of the United States when worn as an ensign. International maritime law—see International Treaty on Law of the Sea, articles 91 and 92—provides that vessels have a "national character" and thus should display a flag (ensign) that corresponds to this national character, especially when in international or foreign waters. Vessels that are formally documented under the federal vessel documentation act, vessels owned by government bodies in the United States, and vessels in the U.S. military unquestionably have U.S. national character, and thus properly hoist a U.S. ensign to show their national character. Vessels that are numbered by the states and small, non-registered craft owned by U.S. citizens and not registered in other countries may also hoist a U.S. ensign to show their national character.