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Early in the 15th century, as new mainland territories were expanded, the first standing army was organized, consisting of condottieri on contract. In its alliance with Florence in 1426, Venice agreed to supply 8,000 cavalry and 3,000 infantry in time of war, and 3,000 and 1,000 in peacetime. Later in that century, uniforms were adopted that featured red-and-white stripes, and a system of honors and pensions developed. Throughout the 15th century, Venetian land forces were almost always on the offensive and were regarded as the most effective in Italy, largely because of the tradition of all classes carrying arms in defense of the city and official encouragement of general military training.

The Crusaders and Venetians, incensed at the murder of their supposed patron, attacked the city once more in 1204. Alexius V, who had a much larger army, although it was much more poorly trained, marched his troops outside Constantinople and seemed to prepare for an all-out assault on the crusader force. As the crusaders panicked and armed everyone they could find, including cooks who wore their pots as helmets, Alexius V turned around and marched his army back into the city. It is possible that his foot soldiers were afraid of the western knights, who had defeated them earlier in the year in skirmishes outside the city, but the actual reason for Alexius' refusal to fight is unknown. Although Innocent III had again warned them not to attack, the papal letter was suppressed by the clergy, and the crusaders prepared for their own attack, while the Venetians attacked from the sea; Alexius' army stayed in the city to fight, along with the imperial bodyguard, the Varangians, but Alexius himself fled during the night.

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.

Venice is served by the newly rebuilt Marco Polo International Airport, or Aeroporto di Venezia Marco Polo, named in honor of its famous citizen. The airport is on the mainland and was rebuilt away from the coast so that visitors now need to get a bus to the pier, from which watertaxi or Aliliguna waterbus can be used.

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.

The idea of rebuilding the bridge in stone was first proposed in 1503. Several projects were considered over the following decades. In 1551 the authorities requested proposals for the renewal of the Rialto Bridge, among other things. Plans were offered by famous architects such as Sansovino, Palladio and Vignola, but all involved a Classical approach with several arches, which was judged inappropriate to the situation.

Marco Polo international airport is an airport located on the Italian mainland near Venice, Italy, exactly in Tessera, a fraction (frazione) of the commune of Venice nearest to Mestre that, before the Fascism, as Mestre was an atonomous commune. Its IATA airport code is VCE and its ICAO airport code is LIPZ.

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.