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By 1450, more than 3,000 Venetian merchant ships were in operation, and most of these could be converted when necessary into either warships or transports. The government required each merchant ship to carry a specified number of weapons (mostly crossbows and javelins) and armor; merchant passengers were also expected to be armed and to fight when necessary. A reserve of some 25 (later 100) war-galleys was maintained in the Arsenal. Galley slaves did not exist in medieval Venice, the oarsmen coming from the city itself or from its possessions, especially Dalmatia. Those from the city were chosen by lot from each parish, their families being supported by the remainder of the parish while the rowers were away. Debtors generally worked off their obligations rowing the galleys. Rowing skills were encouraged through races and regattas.

As the oligarchical element in the constitution developed, the more important functions of the ducal office were assigned to other officials, or to administrative boards, and he who had once been the pilot of the ship became little more than a figurehead. The last doge was Lodovico Manin, who abdicated in May 1797, when Venice passed under the power of Napoleon.

The first dry crossing of the Grand Canal was a pontoon bridge built in 1181 by Nicolò Barattieri. It was called the Ponte della Moneta, presumably because of the mint that stood near its eastern entrance.

By 1303, crossbow practice had become compulsory in the city, with citizens training in groups. As weapons became more expensive and complex to operate, professional soldiers were assigned to help work merchant sailing ships and as rowers in galleys. The company of "Noble Bowmen" was recruited in the later 14th century from among the younger aristocracy and served aboard both war-galleys and armed merchantmen, with the privilege of sharing the captain's cabin.

During the 20th century, when many artesian wells were sunk into the periphery of the lagoon to draw water for local industry, Venice began to subside. It was realised that extraction of the aquifer was the cause. This sinking process has slowed markedly since artesian wells were banned in the 1960s. However, the city is still threatened by more frequent low-level floods (so-called Acqua alta, "high water") that creep to a height of several centimeters over its quays, regularly following certain tides. In many old houses the ground floor is unoccupied due to the periodic floods, but people continue to live and work in the upper stories.

Though Venice was famous for its navy, its army was equally effective. In the 13th century, most Italian city states already were hiring mercenaries, but Venetian troops were still recruited from the lagoon, plus feudal levies from Dalmatia and Istria. In times of emergency, all males between seventeen and sixty years were registered and their weapons were surveyed, with those called to actually fight being organized into companies of twelve. The register of 1338 estimated that 30,000 Venetian men were capable of bearing arms; many of these were skilled crossbowmen. As in other Italian cities, aristocrats and other wealthy men were cavalrymen while the city's conscripts fought as infantry.

Though the people of Venice generally remained orthodox Roman Catholics, the state of Venice was notable for its freedom from religious fanaticism and it enacted not a single execution for religious heresy during the Counter-Reformation. This apparent lack of zeal contributed to its frequently coming into conflict with the Papacy. Venice was threatened with the interdict on a number of occasions and twice suffered its imposition. The second, more famous, occasion was on April 27, 1509, by order of Pope Julius II

The Grand Canal is Venice's largest waterway. It forms one of the major water-traffic corridors in the city.