Thousand Day War
The Thousand Day War was war taking place between 2086 and 2088, beginning with an attempted Martian invasion of Earth in the form of a blitzkreig attempt at aresforming.
The first day of the Human counter offensive saw the United Nations Third Tactical Response Brigade -- comprised mostly of Irish and Ethiopians -- under the command of Brigadier Yembe Lethbridge-Stewart drop onto Olympus Mons, suffering heavy casualties on the way in.
Having already lost their space fleet and feeling themselves at a significant tactical disadvantage, in the early days of the war the Ice Warriors attempted to intimidate the humans by destroying Paris with an asteroid, a gambit that badly misfired (NA: Transit).
In terms of battles, the Humans only suffered one defeat during the Thousand Day War: in the Viis Clarr/Valles Marineris valley. Supreme Grand Marshall Abrasaar Urr'nJass set a trap which killed 15,000 Humans and 10,000 Ice Warriors.
By 2088, 45,000 Humans had died in the war. The war was finally won when Earth troops were [transmat|transmatted]] to Mars, storming the Ice Warrior's base of operations. The majority of the ruling council known as the Eight Point Table were executed (NA: GodEngine, The Dying Days). Though some military nests remained behind in suspended animation, the majority of the surviving Ice Warrior population managed to evacuate the planet and resettle on a world that would become known as New Mars (NA: Legacy, NA: GodEngine, BNA: The Medusa Effect).
After The War
The human victory was so complete that Mars become a colony world. As a precaution against sleeper nests, an intelligent system named JERUSALEM was installed in the Jacksonville infrastructure with the capacity to assess and respond to the possibility of future Martian aggression; it would remain dormant and forgotten for 25 years until mistakenly activated by an unrelated incursion.