The campaign in France was marked by persistent advances made by the Russian-led forces towards Paris despite attempts by Alexander's allies to allow Napoleon an avenue for surrender. In a brilliant deceptive manoeuvre Alexander was able to reach, and take Paris with the help of the treason of Marshal Marmont before Napoleon could reinforce its garrison, effectively ending the campaign. More pragmatically, in 1814 Russia, Britain, Austria, and Prussia had formed the Quadruple Alliance. The allies created an international system to maintain the territorial status quo and prevent the resurgence of an expansionist France. This included each ally maintaining a corps of occupation in France. The Quadruple Alliance, confirmed by a number of international conferences, ensured Russia's influence in Europe, if only because of the proven capability of its army to defeat that of Napoleon and to carry the war to Paris.