The III Corps of the Grande Armée was a military unit during the Napoleonic Wars. The III Corps came to prominence between 1805 and 1809 under the command of Marshal Louis Nicola Davout, when it repeatedly scored impressive victories single-handedly or in conjunction with other French forces. Napoleon called it "My tenth legion", in reference to Julius Caesar's finest unit, the X Equestris.
By the time of Napoleon's invasion of Russia in 1812, it was under the command of Marshal Ney. The corps, like the rest of Napoleon's forces, suffered heavy casualties as the campaign progressed: at the crossing of the Niemen River in 1812, the III Corps' size was estimated at around 44,000 men; by the Battle of Smolensk, only 22,000 men remained.
The III Corps participated in a number of battles, including Austerlitz, Auerstadt, Eylau, Teugen-Hausen and Eckmuhl. The III Corps also fought at Borodino. (http://en.wikipedia.org/wiki/III_Corps_(Grande_Arm%C3%A9e))
This are links to some good writings that pictures Louis Nicola Davout.
https://www.dailymotion.com/video/x6fpu7_1806engl_videogames
http://en.wikipedia.org/wiki/Louis_Nicolas_Davout
http://www.napoleonguide.com/marshal_davout.htm
http://uts.cc.utexas.edu/~jrubarth/gslis/lis385t.16/Napoleon/Davout.html
This is a link with some music : Chant du maréchal Davout
http://www.souvenir-davout.com/spip.php?rubrique3
Marshal Davout's Orders leading to the Battle of Auerstädt .
http://www.napoleon-series.org/military/battles/c_davout1.html
http://www.wtj.com/archives/davout/
Napoleon's Finest: Marshal Louis Davout and His 3rd Corps, Combat Journal of Operations, 1805 - 1807
http://www.napoleon-series.org/reviews/military/c_davout.html
At least a link with all battles of Napoleon,Maps and other things :
http://www.napoleonic-officers.net/web/navigation/officerIndex.html