Corps is a term used for several different kinds of organization. A military innovation by Napoleon I, the formation was first named as such in 1805. The size of a corps varies greatly, but two to five divisions and anywhere from 40,000 to 80,000 are the numbers stated by the US Department of Defense.
The XVIII Airborne Corps command group returns home from Operation Iraqi Freedom in 2009
A division is a large military unit or formation, usually consisting of between 10,000 and 25,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps.
A Priest 105mm self-propelled gun of British 3rd Infantry Division, 1944
Members of the Australian 6th Division at Tobruk, 22 January 1941
Headquarters of 11th Infantry Division of Bangladesh Army near Bogra
British soldiers from the 1st Armoured Division engage Iraqi Army positions with their 81mm mortar in Iraq, 26 March 2003.