Once the abolition of slavery in the rebel states became a military objective, as Union armies advanced south, more slaves were liberated until all three million of them in Confederate territory were freed.

Once the New York Central and Pennsylvania Railroads reached Chicago, that time dynamic changed, and American poleboats became less common, relegated to smaller rivers and more remote streams.

Once destroyers became more than just catchers guarding an anchorage, it was realized that they were also ideal to take over the role of torpedo boats themselves, so they were fitted with torpedo tubes as well as guns.

Once German and Japanese rearmament became clear, the British and American navies consciously focused on building destroyers that were smaller but more numerous than those used by other nations.

Once it became accepted that light is an electromagnetic wave, it was clear that the frequency of light should not change from place to place, since waves from a source with a fixed frequency keep the same frequency everywhere.

Once Christianity was established, the Catholic Church became the focal point for village activities and Guam became a regular port-of-call for the Spanish galleons that crossed the Pacific Ocean from Mexico to the Philippines.

Once in Spain it became a part of Andalusian cuisine, particularly Córdoba and Seville, using stale bread, garlic, olive oil, salt, and vinegar, similar to ajoblanco.

Once he established himself as a professional musician in Leipzig, Telemann became increasingly active in organizing the city's musical life.

Once this was gone, the defeat of the Ottoman Army became inevitable.

Once again the Hotel de Ville, or Town Hall, became the center of attention for the people in revolt ; this time the Hotel de Ville became the seat of the revolutionary government.

Once the laboratory was built, several problems with its construction became apparent.

Once the brothers joined together, their combined talents became one of the most influential forces in the history of American Musical Theatre.

Once regarded as the world's " most optimistic ," Kibaki's regime quickly lost much of its power because it became too closely linked with the discredited Moi forces.

Once back in Detroit he became friends with Uncle Kracker after battling his brother in a freestyle rapping competition ; Uncle Kracker became Kid Rock's DJ.

Once wealthy from trade, the region became lost to modern history and was thought to be only a figment of mythical tales.

Once wealthy from trade, the region became lost to modern history and was thought to be only a figment of mythical tales.

Once Eric XIV of Sweden became king he took quick actions to get involved in the war.

Once a break in the lines was exploited, the cavalry became instrumental to victory, causing further breakage in the lines and wreaking havoc amongst the infantrymen, as it is much easier to kill a man from the top of a horse than to stand on the ground and face a half-ton destrier ( large warhorse ) carrying an armed knight.

Once pigeon meat became popular, commercial hunting started on a prodigious scale.

Once in the chair of Saint Peter, Gregory XIII's rather worldly concerns became secondary and he dedicated himself to reform of the Catholic Church.

Once siege guns were developed the techniques for assaulting a town or a fortress became well known and ritualized.

Once full features became commonplace, however, music was compiled from photoplay music by the pianist, organist, orchestra conductor or the movie studio itself, which included a cue sheet with the film.

Once we have made clear that we are genuinely concerned with a country's development potential, we can be blunt in suggesting the technical conditions that must be met for development to occur.

Once the full extent of this Russian military penetration of Cuba was clear, President Kennedy announced we would take whatever action was appropriate to prevent this, even if we had to go it alone.

Once the Spanish Civil War broke out, Alfonso made it clear he favoured the military uprising against the Popular Front government, but General Francisco Franco in September 1936 declared that the Nationalists would never accept Alfonso as King ( the supporters of the rival Carlist pretender made up an important part of the Franco Army ).

Once an additional 20 of the Carthaginian ships had been hooked and lost to the Romans, Hamilcar retreated with his surviving ships, leaving Duilius with a clear victory.

Sobran also believes " scholars have largely ignored one of the chief themes of the Sonnets: the poet's sense of disgrace .... here can be no doubt that the poet is referring to something real that he expects his friends to know about ; in fact, he makes clear that a wide public knows about it ... Once again the poet's situation matches Oxford's ....

Once they enter, they have three attempts to clear the height.

Once these religious elements are removed, Richards argues that it is clear " the whole episode was political in nature.

Once clear of Tarnover, they disappear together.

Once clear, the two sides of the skin are distinct: the side facing inside the animal and the hair side.

Once an athlete is on their sled they are audibly notified that the track is clear.

Once the aggressive tendencies of the Nazis towards Jews and other minorities became apparent, Keynes made clear his loathing of Nazism.

Once clear of the gun the fins popped open and the engine ignited.

Once a fiery liberal spirit, ah, but now when he speaks he must clear it.

Once clear of the tunnel, the canal passes Blisworth village and reaches Gayton Junction where the Northampton Arm branches off to the east.

Once video cards advanced to SVGA the standard for accessing them was no longer clear.

Once the Fronts pass, they leave cold, dry air, and clear skies behind them.

Once it had become clear that most Jews did not consider Jesus to be the messiah ( see also Rejection of Jesus ) Christians ( among whom were Messianic Jews ) sought a number of new converts from among the gentiles.

Once it is clear that the volume of gold-bearing sediment is larger than a few cubic metres, the placer miners will build rockers or sluice boxes, with which a small group can wash gold from the sediment many times faster than using gold pans.

Once again, the mother has left Sally and her unnamed brother alone for the day, but this time, they are instructed to clear away a huge amount of snow while she is out.

Once the waters are clear, British ships, which are waiting off of the Iraqi coast, will land in Umm Qasr with additional medicine, food and water for the area.

Once set the strings of toffee are cut to length and wrapped in clear paper with a label, known as a ' view ' as it usually has a view of a landmark.

Once it became clear the Ottomans had enough forces to lay siege to Kut, Townshend ordered his cavalry to escape south, which it did, led by Lieut.

Once the Allies had secured a clear superiority in numbers the French found it prudent not to contest them in fleet action.