The First Fleet gave up two squadrons to assist operations in the Periphery during the Periphery Uprising - the Commanding General's Squadron and the Escort Squadron - and the remainder of the First Fleet was effectively destroyed during the opening stages of the Amaris Civil War, although the First Fleet inflicted a substantial and disproportionate level of damage against the Rim Worlds Republic forces before being destroyed.

Together with the two lead vessels of the Second Fleet, the SLS New Earth and the SLS Caph, these six vessels formed the Star League Emergency Command Post Network, or SLECoP. This equipment included a substantial array of intelligence gathering and communication elements, and allowed the vessels to act as mobile command headquarters. In addition to protecting the First Lord and the High Command, the First Fleet was intended to allow the High Command to manage the Star League, the military and any potential conflicts no matter their current location to facilitate this, all four command vessels, the SLS Terra, Star League, McKenna's Pride and Enterprise were fitted out with specialist equipment to allow them to function as specialized command vessels. Furthermore, all ships of the First Fleet had additional intelligence gathering capabilities. However, any new ship that transferred into First Fleet had to go through the Titan Yards in order to undergo operational evaluation. The First Fleet was officially homeported at the Titan Yards in the Terran System, but in reality the ships of this command would use whatever fleet resources happened to be nearby. This meant that the First Fleet spent much of its time deployed around Terra and the core worlds of the Terran Hegemony, although only the three command squadrons were permanently assigned to the First Fleet to keep the combat edge of the First Fleet high, the other vessels and squadrons that made up the First Fleet were rotated periodically with commands from other Fleets in more active areas.

The First Fleet was responsible for the protection of the First Lord and the SLDF High Command.

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