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.

As Joachim Pissarro points out, “ Once such a die-hard Impressionist as Pissarro had turned his back on Impressionism, it was apparent that Impressionism had no chance of surviving.

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

Once there he meets Elayne Trakand, heir apparent to the throne of Andor and her brothers Gawyn and Galad Damodred.

" Once Renard opens the paper and looks at the racing page, several in-jokes are apparent in the names of the listed jockeys, which include " Serling ", " Clemens " ( referencing director of photography George Clemens ), " Houghton " ( referencing producer Buck Houghton ), " Butler " ( referencing set decorator Rudy Butler ) and " Denault " ( referencing assistant director Edward Denault ).

Once again musical differences became apparent and in February 1999 the band decided to split.

Daly told HitQuarters: " Once they got on stage and started playing it was apparent the magic was in the music.

Once this became apparent, at the end of July, Hitler and his commanders had to decide how to proceed.

Once it was apparent that the United States were actually going to purchase Cuba and intended to U. S. Americanize it, Marti " spoke out loudly and bravely against such action, stating the opinion of many Cubans on the United States of America.

Once Wheeler's confession became apparent, the other members of the gang fled their usual haunts.

Once it became apparent that the Meech Lake Accord would fail, Getty's government introduced the Senatorial Selection Act, which provided for an election process whenever there was a vacant Senate seat for Alberta.

Once free, the demon discovered the true nature of Tim's apparent defeat: the boy had hidden his soul inside the memory Barbatos took and once inside the demon it slept, slowly taking complete control of Barbatos ' body until Tim owned it completely, remodeling it with his magic to resemble his own at the age of fourteen.

Once apparent, the radiographic findings in asbestosis may slowly progress or remain static, even in the absence of further asbestos exposure.

Once a mark enters the circle of apparent players and faces the operator, the gang surrounds the player to discourage an easy exit and to keep other pedestrians from entering and disrupting the confidence trick gang's action on the main mark.

Once the object has broken free of the bottom, only the apparent weight remains, and a controlled lift requires a way of managing the sudden decrease of resistance to the lifting force.

Once it became apparent that DesDiv 45's torpedo attack had failed to achieve complete surprise, at around 0250, the American cruisers opened fire, quickly disabling Sendai.

Once the necessary legislation is passed, this means that should Prince William's first child be female, she will be heir apparent and eventually Queen regnant.

Once the baby shark is captured, it becomes apparent that it was the mother, a much larger shark who also entered the park, who was the real killer.

Once they arrive, it is immediately apparent to both Grace and her family that Peter and Wang-mu have achieved the impossible and traveled faster-than light.

Once inside a cell, the vegetative stage increases in size and multiplies, effecting an apparent concurrent reduction of RNA synthesis in the host cell.

Naomi Long Madgett writes: " His interest in Russia, apparent in his translations of poems by Aleksander Pushkin (' I Loved You Once ,' After the Killing ) and Konstantin Simonov (' My Native Land ' and ' Wait for Me ' in A Litany of Friends ), was heightened by a visit to the Soviet Union in 1966.

Once the defeasance process is understood, several competing interests become apparent.

Once it was apparent that the fire could not be extinguished, the ship's three lifeboats were prepared for launch.

Once there, it becomes apparent that Grendel believes she is an android, because she exactly resembles the captive Strella — and Romana too is imprisoned like the Princess.