During the 19th century, the development of mines led to a new type of naval warfare.

During World War II he taught naval personnel navigation at Northern Arizona University.

During wartime, a shipping convoy will have a ranking officer — sometimes an active-duty naval officer, at other times a civilian master or retired naval officer — designated as the convoy commodore.

During a naval campaign of 1339, and again in 1377, the town was raided and burnt by the French, and seems then to have gone into a decline.

During his naval days, Bogart's character and values developed independent of family influence, and he began to rebel somewhat against their values.

During World War I, the United States Navy acquired large numbers of privately owned and commercial ships and craft for use as patrol vessels, mine warfare vessels, and various types of naval auxiliary ships, some of them with identical names.

During the 19th century, many maritime nations established hydrographic offices to provide means for improving the navigation of naval and merchant vessels by providing nautical publications, nautical charts, and other navigational services.

During the 19th century, after Schleswig-Holstein had come under the government of Prussia ( from 1871 the German Empire ) following the Second Schleswig War in 1864, a combination of naval interests — the German navy wanted to link its bases in the Baltic and the North Sea without the need to sail around Denmark — and commercial pressure encouraged the development of a new canal.

During this period, together with his uncle, he took part in many naval wars of the Ottoman Empire against Spain, the Republic of Genoa and the Republic of Venice, including the First Battle of Lepanto ( Battle of Zonchio ) in 1499 and Second Battle of Lepanto ( Battle of Modon ) in 1500.

During the Cultural Revolution, a number of top naval commissars and commanders were purged, and naval forces were used to suppress a revolt in Wuhan in July 1967, but the service largely avoided the turmoil affecting the country.

During the research for his dual biography of Scott and Roald Amundsen, polar historian Roland Huntford investigated a possible scandal in Scott's early naval career, related to the period 1889 – 90 when Scott was a lieutenant on.

During the 15th century, China's Ming Dynasty assembled one of the largest and most powerful naval fleet in the world for the diplomatic and power projection voyages of Zheng He.

During this period the island was strongly garrisoned by regular British regimental troops and by the local St Helena Regiment, with naval shipping circling the island.

During the Hellenistic period, the island was a major naval base for the Ptolemaic Egypt.

During World War I many Shetlanders served in the Gordon Highlanders, a further 3, 000 served in the Merchant Navy and more than 1500 in a special local naval reserve.

During World War II a Norwegian naval unit nicknamed the " Shetland Bus " was established by the Special Operations Executive in the autumn of 1940 with a base first at Lunna and later in Scalloway to conduct operations around the coast of Norway.

During the Punic Wars of the 3rd century BC, the harbour at Ostia became a key naval base.

During the decade, Themistocles continued to advocate the expansion of Athenian naval power.

During World War II United States naval forces employed fast wooden PT boats in the South Pacific in a number of roles in addition to the originally envisioned one of torpedo attack.

During the Second World War, the historic city was largely free from attack, the only aggressive effort of note being Operation Bowler, a precision strike on the German naval operations there in 1945.

During the early months of 1781, British and American forces began concentrating in Virginia, a state that had previously not experienced more than naval raids.

During the closing stages of the Iran-Iraq War the United States Navy began conducting operations in the Persian Gulf to protect US-flagged ships from attack by Iranian naval forces.

During the past decade the program has been carried on through expansion of free higher education in state universities, state colleges, and community colleges.

During the early 1960s, while also active in ASCII standardization, IBM simultaneously introduced in its product line of System / 360 the 8-bit Extended Binary Coded Decimal Interchange Code ( EBCDIC ), an expansion of their 6-bit binary-coded decimal ( BCDIC ) representation used in earlier card punches.

During the time of colonial expansion in the 17th century, the true progenitors of the modern corporation emerged as the " chartered company ".

During the expansion, Drexel was officially united with the former MCP Hahnemann University, creating the Drexel University College of Medicine in 2002 ; and in the fall of 2006, Drexel established its School of Law, which was fully accredited by American Bar Association ( ABA ) in 2011.

During his reign Lithuania reached the peak of its territorial expansion, centralization of the state had begun, and the Lithuanian nobility became increasingly prominent in state politics.

During the 9th century peak of the Viking expansion, large fleets set out to attack the degrading Frankish empire by attacking up navigable rivers such as the Seine.

During his reign the Aztec Empire was consolidated, major expansion was undertaken and Tenochtitlan started becoming the dominant partner of the Aztec Triple Alliance.

During this period in the 15th and 16th centuries, the Ottoman Empire entered a long period of conquest and expansion, extending its borders deep into Europe and North Africa.

During 1925, however, Scott, like many of his contemporaries / competitors, began an ambitious expansion program designed to make the company more competitive with other automobile manufacturers by offering cars in different price ranges.

During an age of tremendous expansion in higher education, Porter resisted the rise of the new research university, claiming that an eager embrace of its ideals would corrupt undergraduate education.

During the negotiations, Aeschines seeks to reconcile the Athenians to Macedonia's expansion into Greece.

During this later period some immigration and expansion continued.

During the following decades, the abolitionist movement grew in northern states, and Congress limited the expansion of slavery in new states admitted to the union.

During the Migration Period, the Slavic tribe of the Carantanians migrated into the Alps in the wake of the expansion of their Avar overlords during the 7th century, mixed with the Celto-Romanic population, and established the realm of Carantania, which covered much of eastern and central Austrian territory.

During this period there was, for the first time, a significant expansion in the islands ' schools.

During the 1970s, there was a major puzzle in that the density of baryons as calculated by Big Bang nucleosynthesis was much less than the observed mass of the universe based on calculations of the expansion rate.

During his term, the controversy over the expansion of slavery in new lands had reemerged with the addition of the lands ceded to the United States by Mexico in the Treaty of Guadalupe Hidalgo at the conclusion of the Mexican-American War.

During such periods of rapid state formation or expansion ( Asante and Dahomey being good examples ), slavery formed an important element of political life which the Europeans exploited: As Queen Sara's plea to the Portuguese courts revealed, the system became " sell to the Europeans or be sold to the Europeans ".

During this period, there was rapid expansion among small and medium-sized firms and a gradual retrenchment among the large firms which had hitherto characterised the region's industrial base.

During the 90's a slow expansion was taken, and underground hip hop reached many listeners over the years.

During the 1920s, the industrial expansion of the region continued with the radium and copper factories in Olen, the glass factory in Mol-Gompel and the diamond industry in Grobbendonk and Nijlen.

During the Miocene there was expansion of Sea of Japan.

During the 1980s and 1990s Berkeley Lab physicists and astronomers formed the Supernova Cosmology Project ( SCP ), using Type Ia supernovae as “ standard candles ” to measure the expansion rate of the universe.