The Interplanetary War was one of the first rebellions to occur within the Human colonies and for the UEG. However, the war was the first instance in which UNSC Marines were deployed, proving to be a effective fighting force.
Overpopulation on Earth begins civil unrest in the Sol colonies which eventually leads to the creation of the Koslovics on Earth, and the Frieden on the Jovian Moons. The UN responds, but this escalates into war.
The war started on March 30, 2164 and ended July 13, 2170.