Sabrage /səˈbrɑːʒ/ is a technique for opening a Champagne bottle with a sabre, used for ceremonial occasions. The sabre is slid along the body of the bottle to break the entire neck away from the bottle, leaving only the base of the bottle open and ready to pour. The force of the backside of the blade hitting the lip breaks the glass to separate the collar from the neck of the bottle. Note that one does not use the 'sharp' side of the blade, but instead, turns it around. The cork and collar remain together after separating from the neck.
This technique became popular in France when the army of Napoleon visited many of the aristocratic domains. It was just after the French Revolution and the sabre was the weapon of choice of Napoleon's light cavalry (the Hussars). Napoleon's spectacular victories across all Europe gave them plenty of reason to celebrate. During these parties the cavalry would open the Champagne with their sabres. Napoleon, known to have said, "Champagne! In victory one deserves it; in defeat one needs it." may have encouraged this.
There are many stories about this tradition. One of the more spirited tales is that of Madame Clicquot, who had inherited her husband's small Champagne house at the age of 27. She used to entertain Napoleon's officers in her vineyard, and as they rode off in the early morning with their complimentary bottle of Champagne, they would open it with their sabre to impress the rich young widow.
Champagne sword 
A Champagne sword (sabre à champagne) is an instrument specially made for sabrage. Some swords have short blades, around 12 inches (30 cm) long and resemble large knives, although others have longer blades. The blades are completely blunt – a sharpened edge is unnecessary because in sabrage, the impact is important, not the sharpness. Champagne bottles can even be opened with a spatula using the same method.
The bottle neck is held at an angle of approximately 20 degrees and the sword is cast down on it. The experienced sommelier can open the bottle with little loss of Champagne. However, it is advised to allow a small flow in order to wash away any loose shards of glass that may be adhering to the neck. The first glass poured should also be checked for small glass shards.
Physics of sabrage 
A Champagne bottle holds a considerable amount of pressure. With early designs, bottles tended to explode and the manufacturers kept making them thicker until they could contain the pressure caused by the release of carbon dioxide during the secondary fermentation. The inside pressure of a typical Champagne bottle is around 90 pounds per square inch (620 kPa). The diameter of the opening is 0.7 inches (18 mm), so there is a force of about 35 pounds-force (160 N) trying to push the cork out of the bottle.
At the opening of the bottle, there is a lip that creates a stress concentration. On the vertical seam of the bottle there is a thin, faintly visible, prepared seam, which creates a second stress concentration. At the intersection of the seam and the lip, both stress concentrations combine and the strength of the glass is cut by more than fifty percent. The impact of the saber on this weak point creates a crack that rapidly propagates through the glass, fueled by the momentum of the saber and the pressure in the bottle. Once the crack has severed the top from the bottle, the pressure inside the bottle and the transferred momentum from the saber will send the top flying, typically for a distance of 5–10 metres (16–33 ft).
There is currently no world championship in Sabrage. The greatest number of champagne bottles sabered in one minute, thirty-two, was achieved by Julio Chang in Marbella, Spain, on 18 April 2011. The greatest number of champagne bottles sabered simultaneously was achieved by 196 participants in an event organised by the Centro Empresarial e Cultural de Garibaldi at a champagne festival in Garibaldi, Rio Grande do Sul, Brazil, on 8 October 2011.
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