Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The I Corps (French: 1er Corps d'Armée) was first formed before World War I. During World War II it fought in the Campaign for France in 1940, on the Mediterranean islands of Corsica and Elba in 1943 - 1944, and in the campaigns to liberate France in 1944 and invade Germany in 1945.The Corps saw service throughout the entirety of World War I, including participating in the Battle of Passchendaele (as part of the French First Army). At the time of the Battle of Passchendaele, the Corps comprised the 1st Division, 2nd Division, 51st Division and 162nd Division.