==Background==
Napoleon after After a string of brilliant victories had made , Napoleon crowned himself Emperor of the FrenchFrance. By 1805, his armies had proven victorious in Germany, Spain, and Italy and he was the most powerful man in Europe. This prompted the other powers in Europe to form the Third Coalition in order to defeat the French. This Coalition included England, Russia, Prussia and Austria. The formation of this alliance caught Napoleon off guard. He had been planning for the invasion of England and had amassed a large army in northern France, known as the Army of England. However, he learned that Austria, Prussia, and the Russians were mobilizing and planned to attack the French and their allies. Napoleon abandoned his plans to invade England and decided to attack his enemies in the east before they could unite their forces. This was typical of Napoleon who was always willing to go on the attack and believed that the key to success was to never let the enemy to settle and attack them before they were in a position to attack the French.<ref> David G. Chandler, <i>[https://www.amazon.com/gp/product/0025236601/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0025236601&linkCode=as2&tag=dailyh0c-20&linkId=b7102b4553a33f72683b1ad69f241308 The Campaigns of Napoleon]</i>.(Longman, N.Y., 2000) p. 407</ref>
[[File: Austerlitz 2.jpg|thumbnail|275px|Napoelon at Austerlitz]]
Moving with great speed he took his army of over 200,000 French and allied troops from their encampments near Boulogne and crossed into Germany on September the 25th. The army was divided into several corps. They were independent units with attachments of artillery and each corps commander had a great deal of autonomy in their decision making. The army had also two cavalry divisions of approximately 20,000. The Austrians with their German allies decided to meet Napoleon in Bavaria in Germany. They intended to slow down his army and to defend Austria from a French invasion until the arrival of the huge Russian army. The Prussians because of internal politics had been very slow in mobilizing and the Austrians were forced to meet Napoleon almost on their own. The Austrian General Mack established a line of defense near Ulm in Bavaria. However, Napoleon’s army was very quick and after a feint attack, he was able to appear at the rear of the Austrian army and inflicted a decisive defeat on Mack. In this battle, the French captured Mack and some 23,000 of his men. Napoleon was free to march into Central Europe.<ref> Chandler, p. 401</ref>
