Japanese destroyer Uranami (1928)

A light cruiser is a type of small or medium-sized warship. The term is a shortening of the phrase "light armored cruiser", describing a small ship that carried armor in the same way as an armored cruiser: a protective belt and deck. Prior to this smaller cruisers had been of the protected cruiser model, possessing armored decks only. While lighter and smaller than other contemporary ships they were still true cruisers, retaining the extended radius of action and self-sufficiency to act independently around the world. Through their history they served in a variety of roles, primarily as convoy escorts and destroyer command ships, but also as scouts and fleet support vessels for battle fleets.

Uraga Dock Company was a major privately owned shipyard in Uraga, Japan, which built numerous warships for the Imperial Japanese Navy.

Laying the keel or laying down is the formal recognition of the start of a ship's construction. It is often marked with a ceremony attended by dignitaries from the shipbuilding company and the ultimate owners of the ship.

The Battle of Shanghai was the first of the twenty-two major engagements fought between the National Revolutionary Army (NRA) of the Republic of China (ROC) and the Imperial Japanese Army (IJA) of the Empire of Japan at the beginning of the Second Sino-Japanese War. It lasted from August 13, 1937, to November 26, 1937, and was one of the largest and bloodiest battles of the entire war, later described as "Stalingrad on the Yangtze", and is often regarded as the battle where World War II started. After over three months of extensive fighting on land, in the air and at sea, the battle concluded with a victory for Japan.

Hangzhou, also romanized as Hangchow, is the capital and most populous city of Zhejiang, China. It is located in the northwestern part of the province, sitting at the head of Hangzhou Bay, which separates Shanghai and Ningbo. Hangzhou grew to prominence as the southern terminus of the Grand Canal and has been one of China's most renowned and prosperous cities for much of the last millennium. It is a major economic and e-commerce hub within China, and the second biggest city in Yangtze Delta after Shanghai. Hangzhou is classified as a sub-provincial city and forms the core of the Hangzhou metropolitan area, the fourth-largest in China after Guangzhou-Shenzhen Pearl River agglomeration, Shanghai-Suzhou-Wuxi-Changzhou conurbation and Beijing. As of 2019, the Hangzhou metropolitan area was estimated to produce a gross metropolitan product (nominal) of 3.2 trillion yuan, making it larger than the economy of Nigeria. As of the 2020 Chinese census, it had a total population of 11,936,010 inhabitants. However, its metropolitan area, populated by 13.035 million people over an area of 8,107.9 km2 (3,130.5 sq mi), consists of all urban districts in Hangzhou and 3 urban districts of the city of Shaoxing.

The attack on Pearl Harbor was a surprise military strike by the Imperial Japanese Navy Air Service upon the United States against the U.S. naval base at Pearl Harbor in Honolulu, Territory of Hawaii, just before 8:00 a.m. on Sunday, December 7, 1941. The United States was a neutral country at the time; the attack led to its formal entry into World War II the next day. The Japanese military leadership referred to the attack as the Hawaii Operation and Operation AI, and as Operation Z during its planning.

Hainan is the smallest and southernmost province of the People's Republic of China (PRC), consisting of various islands in the South China Sea. Hainan Island, the largest and most populous island in China, makes up the vast majority (97%) of the province. The name means "south of the sea", reflecting the island's position south of the Qiongzhou Strait, which separates it from Leizhou Peninsula and the China mainland.

The term "British Malaya" loosely describes a set of states on the Malay Peninsula and the island of Singapore that were brought under British hegemony or control between the late 18th and the mid-20th century. Unlike the term "British India", which excludes the Indian princely states, British Malaya is often used to refer to the Federated and the Unfederated Malay States, which were British protectorates with their own local rulers, as well as the Straits Settlements, which were under the sovereignty and direct rule of the British Crown, after a period of control by the East India Company.

British Borneo comprised the four northern parts of the island of Borneo, which are now the country of Brunei, two Malaysian states of Sabah and Sarawak, and the Malaysian federal territory of Labuan. During the British colonial rule before World War II, Sarawak was known as the Raj of Sarawak (1841–1946), Sabah was known as North Borneo (1881–1946), and Labuan was known as the Crown Colony of Labuan (1848–1946). Between World War II and their independence from Britain, Sarawak became the Crown Colony of Sarawak (1946–1963) whereas Sabah and Labuan combined to form the Crown Colony of North Borneo (1946–1963). The Kingdom of Brunei (1888/1906-1984) was a protectorate of the United Kingdom since the 1888/1906 Protectorate Agreement, and was known as British Protectorate State of Brunei.

Norway, officially the Kingdom of Norway, is a Nordic country in Northern Europe, the mainland territory of which comprises the western and northernmost portion of the Scandinavian Peninsula. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of Norway. Bouvet Island, located in the Subantarctic, is a dependency of Norway; it also lays claims to the Antarctic territories of Peter I Island and Queen Maud Land. The capital and largest city in Norway is Oslo.

O 20, laid down as K XX, was a O 19-class submarine of the Royal Netherlands Navy that saw service during World War II. O 20 along with her sister ship O 19 were the first boats in the world to be equipped with a submarine snorkel that allowed the submarine to run its diesel engines while submerged.

Ayanami was the eleventh of twenty-four Fubuki-class destroyers, built for the Imperial Japanese Navy following World War I. When commissioned, these ships were the most powerful destroyers in the world. They served as first-line destroyers through the 1930s, and remained formidable weapons systems well into the Pacific War.

Yūgiri was the fourteenth of twenty-four Fubuki-class destroyers, built for the Imperial Japanese Navy following World War I. When introduced into service, these ships were the most powerful destroyers in the world. They served as first-line destroyers through the 1930s, and remained formidable weapons systems well into the Pacific War.

The heavy cruiser was a type of cruiser, a naval warship designed for long range and high speed, armed generally with naval guns of roughly 203 mm (8 inches) in calibre, whose design parameters were dictated by the Washington Naval Treaty of 1922 and the London Naval Treaty of 1930. The heavy cruiser is part of a lineage of ship design from 1915 through the early 1950s, although the term "heavy cruiser" only came into formal use in 1930. The heavy cruiser's immediate precursors were the light cruiser designs of the 1900s and 1910s, rather than the armoured cruisers of the years before 1905. When the armoured cruiser was supplanted by the battlecruiser, an intermediate ship type between this and the light cruiser was found to be needed—one larger and more powerful than the light cruisers of a potential enemy but not as large and expensive as the battlecruiser so as to be built in sufficient numbers to protect merchant ships and serve in a number of combat theatres.