2163
From Halopedia, the Halo wiki
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December 2163: In a conflict that stemmed from the Rain Forest Wars, the three primary Earth factions clashes again, this time on Mars. A series of lightning strikes against Koslovic forces near the Argyre Planitia marking the first extra-terrestrial deployment of Marines. The campaign is an unqualified success. As a result, future military doctrines favour large contingents of Marines for ground assaults and ship-boarding actions.[1]
