http://www.uesp.net/wiki/Skyrim:The_Great_War
Author's Note: Much of what is written in this book is pieced together from documents captured from the enemy during the war, interrogation of prisoners, and eyewitness accounts from surviving soldiers and Imperial officers. I myself commanded the Tenth Legion in http://www.uesp.net/wiki/Lore:Hammerfell and http://www.uesp.net/wiki/Lore:Cyrodiil until I was wounded in 175 during the assault on the http://www.uesp.net/wiki/Lore:Imperial_City. That said, the full truth of some events may never be known. I have done my best to fill in the gaps with educated conjectures based on my experience as well as my hard-earned knowledge of the enemy.
The two most controversial terms of the Concordat were the banning of the worship of Talos and the cession of a large section of southern Hammerfell (most of what was already occupied by Aldmeri forces)
In the end, the heroic Redguards fought the Aldmeri Dominion to a standstill, although the war lasted for five more years and left southern Hammerfell devastated. The Redguards say that this proves that the White-Gold Concordat was unnecessary, and that if Titus II had kept his nerve, the Aldmeri could have been truly defeated by the combined forces of Hammerfell and the rest of the Empire.
In 4E 174, the Thalmor leadership committed all available forces to the campaign in Cyrodiil, gambling on a decisive victory to end the war once and for all. In the end, the main Aldmeri army in Cyrodiil was completely destroyed.