0079.01.03
The Principality of Zeon formally declares war on the Earth Federation Government, sparking the outbreak of the One Year War.

0079.01.04
Zeon’s military initiates Operation British. The Side 2 colony known as Island Iffish begins its descent toward Earth.

0079.01.08
The Earth Federation’s Tianem Fleet intercepts the descending colony. A fleet battle erupts between Federation and Zeon forces.

0079.01.10
The forward half of the colony, intended to strike Jaburo, crashes into Sydney instead. The remaining sections fall into the Pacific Ocean and onto the North American continent.

0079.01.11
Side 6 declares its neutrality.

0079.01.13
Zeon Forces resume Operation British.

0079.01.15
The Principality begins its Loum Offensive (Battle of Loum).

0079.01.16
A Zeon mobile suit squadron known as the Black Tri-Stars captures Federation General Revil.

0079.01.28
The Federation government decides to accept a ceasefire treaty proposed by the Principality of Zeon.

0079.01.31
General Revil, having escaped captivity and returned to the Federation, delivers a public address. Despite the treaty being signed, the Federation declares it will continue to fight rather than truly cease hostilities.

0079.02.07
Zeon launches a planetary invasion, commencing a large-scale drop operation onto Earth.

0079.04.01
Determined to counter Zeon’s mobile suits, the Federation enacts the V Project. Concurrently, it implements the Vinson Plan, a fleet reorganization that anticipates the use of mobile suits aboard warships.

0079.05.17
The Principality completes its space fortress Solomon.

0079.06
Zeon establishes the Flanagan Agency.

0079.06.30
Zeon finishes construction of its second space fortress, A Baoa Qu.

0079.07.07
The Federation completes the assault carrier Pegasus.

0079.08
The Federation begins final testing of its new mobile suits, including the Gundam, at Side 7.

0079.09.18
A Zeon unit led by Char Aznable infiltrates Side 7, capturing the Federation’s newly developed Gundam and seizing the Pegasus. Char, piloting the stolen Gundam, engages the Federation’s RX-78-01 Gundam, destroying it. During this operation, the Zeon pilot Gene is forced to stand down due to a malfunction in his Zaku and does not participate.

The captured Gundam and Pegasus are delivered to Dozle Zabi. A joint team under Kycilia and Dozle begins analyzing the Gundam. As a result, Zeon cancels its plan to build a large-scale mobile armor equipped with psycommu technology. The Pegasus is repainted, renamed Sodon, and incorporated into Zeon’s Space Assault Force.

Meanwhile, Garma Zabi, commander of Zeon’s Earth Attack Force, resigns from Zeon’s military due to a personal matter.

0079.10–11
Under pressure from the Federation’s counteroffensive, Zeon withdraws from Odessa and North America, both of which it had briefly occupied.

0079
Around the same time, Zeon executes another drop operation against the Federation’s main base at Jaburo but eventually retreats. The Federation, having retained experimental models of the Guncannon, decides to mass-produce it as a Light Cannon.

Zeon proceeds with reverse-engineering the captured Gundam to develop new mobile suits. Zeonic’s MS-14 project is defeated in development competition, and a simplified Gundam-based mobile suit is officially adopted instead. At Dozle Zabi’s request, efforts to mass-produce the Big Zam continue.

On the Moon at Granada, the Flanagan Agency begins installing psycommu systems in new mobile suit designs.

The First Battle of Solomon erupts. The Federation employs its Solar System weapon. Dozle Zabi deploys in the first Big Zam unit but is defeated. Solomon falls to the Federation.

Challia Bull returns from Jupiter and meets Char Aznable. A Gundam fitted with a psycommu system attacks Solomon’s docking facilities using Bits. Challia Bull sorties as well, having just received the mobile armor Kikeroga.

Zeon places M’Quve in overall command of the battle for Luna II. Federation officer Wakkein, facing defeat, launches a plan to drop Confeito (the captured fortress Solomon) onto Granada. M’Quve, in turn, orders Char’s troops, who have been standing by, to defend Granada.

The Second Battle of Solomon begins. Char launches an assault on Solomon using the Sodon, successfully landing troops. Although Char’s forces fail to halt the dropping fortress, a phenomenon known as “Zeknova” occurs, foiling Wakkein’s plan.

Luna II subsequently falls to Zeon. The Federation Forces high command opens negotiations for a ceasefire.

0080.01.03
With the Federation in full retreat, the One Year War concludes.