Nearly 50 years after Napoleon met his Waterloo, generals across the West continued to study his tactics and engage their armies the same way armies fought during the Napoleonic Era. Despite advances in military technology and the advent of railroads for transportation, all of which made defensive warfare more effective, acclaimed military geniuses like Robert E. Lee used flank attacks and infantry charges against superior numbers in an effort to win decisive victories, and it would not be until World War I that concepts of modern warfare made the Napoleonic Era of the early 19th century outdated. For those questioning why generals continued using tactics from the Napoleonic Era even as technology changed the battlefield, the Battle of Austerlitz may provide the best answer. Napoleon is regarded as one of history's greatest generals, and Austerlitz was his greatest victory. In 1805, Britain, Austria, and Russia allied together to form the Third Coalition against the French, and the Third Coalition's forces consisted of armies from Austria and Russia, with Britain providing naval support as well as its financial powers. Napoleon had already defeated and mostly destroyed an Austrian army in October at Ulm before it could link up with the Russians, setting the stage for the Battle of Austerlitz to be the culmination of the war against the Third Coalition as a whole in early December. Despite the smashing victory at Ulm, Napoleon's French army would still be well outnumbered at Austerlitz by a joint Russo-Austrian army in a battle that would also come to be known as the Battle of Three Emperors. At Waterloo, however, it would end disastrously, as Napoleon's armies were unable to dislodge Wellington and unable to keep the Prussians from linking up with the British. The battle would end with the French suffering nearly 60% casualties, the end of Napoleon's reign, and the restructuring of the European map.
