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Bronze Age

The first weapons that can be described as "swords" date to around 3300 BC. They have been found in Arslantepe, Turkey, are made from arsenical bronze, and are about 60 cm (24 in) long. Some of them are inlaid with silver.

The sword developed from the knife or dagger. The sword became differentiated from the dagger during the Bronze Age (c. 3000 BC), when copper and bronze weapons were produced with long leaf-shaped blades and with hilts consisting of an extension of the blade in handle form. A knife is unlike a dagger in that a knife has only one cutting surface, while a dagger has two cutting surfaces. Construction of longer blades became possible during the 3rd millennium BC in the Middle East, first in arsenic copper, then in tin-bronze.

Blades longer than 60 cm (24 in) were rare and not practical until the late Bronze Age because the Young's modulus (stiffness) of bronze is relatively low, and consequently longer blades would bend easily. The development of the sword out of the dagger was gradual; the first weapons that can be classified as swords without any ambiguity are those found in Minoan Crete, dated to about 1700 BC, reaching a total length of more than 100 cm (39 in). These are the "type A" swords of the Aegean Bronze Age.

One of the most important, and longest-lasting, types of swords of the European Bronze Age was the Naue II type (named for Julius Naue who first described them), also known as Griffzungenschwert (lit. "grip-tongue sword"). This type first appears in c. the 13th century BC in Northern Italy (or a general Urnfield background), and survives well into the Iron Age, with a life-span of about seven centuries. During its lifetime, metallurgy changed from bronze to iron, but not its basic design.

Naue II swords were exported from Europe to the Aegean, and as far afield as Ugarit, beginning about 1200 BC, i.e. just a few decades before the final collapse of the palace cultures in the Bronze Age collapse. Naue II swords could be as long as 85 cm, but most specimens fall into the 60 to 70 cm range. Robert Drews linked the Naue Type II Swords, which spread from Southern Europe into the Mediterranean, with the Bronze Age collapse. Naue II swords, along with Nordic full-hilted swords, were made with functionality and aesthetics in mind. The hilts of these swords were beautifully crafted and often contained false rivets in order to make the sword more visually appealing. Swords coming from northern Denmark and northern Germany usually contained three or more fake rivets in the hilt.

Sword production in China is attested from the Bronze Age Shang dynasty. The technology for bronze swords reached its high point during the Warring States period and Qin dynasty. Amongst the Warring States period swords, some unique technologies were used, such as casting high tin edges over softer, lower tin cores, or the application of diamond shaped patterns on the blade (see sword of Goujian). Also unique for Chinese bronzes is the consistent use of high tin bronze (17–21% tin) which is very hard and breaks if stressed too far, whereas other cultures preferred lower tin bronze (usually 10%), which bends if stressed too far. Although iron swords were made alongside bronze, it was not until the early Han period that iron completely replaced bronze.

In the Indian subcontinent, earliest available Bronze age swords of copper were discovered in the Indus Valley civilization sites in the northwestern regions of South Asia. Swords have been recovered in archaeological findings throughout the Ganges - Jamuna Doab region of Indian subcontinent, consisting of bronze but more commonly copper. Diverse specimens have been discovered in Fatehgarh, where there are several varieties of hilt. These swords have been variously dated to times between 1700 and 1400 BC. Other swords from this period in India have been discovered from Kallur, Raichur.