Massassi Group

"He commands one of the largest rebel cells that I know of. With him and his fleet, we have a real shot at taking out the Imperial factories on Lothal."

- Kanan Jarrus, on Jan Dodonna and his rebel cell

The Massassi group, also known as the Massassi unit, was considered to be one of the largest rebel cell that fought against the Galactic Empire in the years prior to the Battle of Yavin. Aligned with a rebel network, this rebel cell had many members and was led by General Jan Dodonna, The unit was based at the Great Temple on Yavin 4. Eventually the Massassi group, along with other rebel cells, would organize and become the Alliance to Restore the Republic and its base grew to be the Rebel Alliance's main hidden fortress. The unit was instrumental in the battles of Scarif and Yavin, in the latter of which it was able to destroy the Death Star battle station.

Formation
General Jan Dodonna, a former bridge officer on a Venator-class Star Destroyer during the Clone Wars, became disillusioned with the Galactic Empire and defected to the growing rebellion, a loose collection of rebel cells secretly coordinated by Imperial Senator Bail Organa, and by 5 BBY, he led a team of rebels against the Empire. Leevan Tenza was a member of this group, however an incident where he disobeyed orders and preemptively engaged an Imperial target led to his court-martial and defection to Saw Gerrera's Partisans.

Obtaining Y-wings
"We have orders to deliver these bombers to General Dodonna's unit. They're part of a wider rebellion we're working to build."

- Hera Syndulla, referring to the Y-wing bombers stolen by the Phoenix Squadron

In 2 BBY, members of Phoenix Squadron, which also operated as part of the rebel network, managed to steal five antiquated Republic Navy BTL Y-wing light bombers from an Imperial salvage yard, which they planned to deliver to the unit. The Y-wings eventually made their way to Dodonna's unit, where they would become part of Gold Squadron, the cell's starfighter squadron led by Gold Leader Captain Jon 'Dutch' Vander, protecting rebel convoys as well as attacking a few soft Imperial targets.

Escorting Mon Mothma
Shortly after the delivery of the Y-wings, Senator Mon Mothma was forced to flee her homeworld of Chandrila as a branded traitor after publicly denouncing the Empire. Gold Squadron took on the duty of protecting the Senator and escorting her to Dantooine, where they would rendezvous with other rebel cells. Meeting up with the Phoenix Squadron Spectres for refueling of the Senator's Taylander shuttle Chandrila Mistress, the squadron was attacked by TIE fighters and forced to jump to hyperspace. At the advice of Phoenix Leader Hera Syndulla, the rebels took the old smuggler's route through the Archeon Nebula to escape the Lothal sector undetected. However, an experimental TIE/D Defender starfighter decimated the squadron, until it was stopped by Vander and Ezra Bridger (flying as Gold Two). The remaining squadron members, Vander and the original Gold Two, then arrived safely with the Senator at Dantooine. General Dodonna would arrive with Jun Sato and the rest of Phoenix Squadron shortly after, and, with the arrival of the other cells, the Alliance to Restore the Republic would be formed.

Battle of Atollon
General Dodonna and the Massassi group then arrived at Atollon to assist Commander Jun Sato and his Phoenix Squadron in taking out the TIE/D Defender factories on Lothal. However, the Massassi group's trajectory, in addition to ISB Agent Alexsandr Kallus's Fulcrum transmission's trajectory allowed Grand Admiral Thrawn and his Seventh Fleet to locate Chopper Base on Atollon.

When the Seventh Fleet arrived, the Massassi group attempted to retreat, but were prevented from jumping into hyperspace by the Imperials' Interdictor cruisers. Both the Massassi group and Phoenix Squadron then fought Thrawn's forces, in an attack intended by Hera, Sato and Dodonna as a diversion to allow Lieutenant Commander Ezra Bridger to escape in the Gauntlet to inform the Rebel high command and Senator Mon Mothma of Thrawn's siege. Ultimately, Sato sacrificed himself and his ship, the Phoenix Home, by ramming Imperial Admiral Kassius Konstantine's Interdictor to allow Ezra to reach hyperspace.

The Massassi group lost many of their cruisers and starfighters. The survivors then retreated to Chopper Base. There, they attempted to hold off Thrawn's ground forces. Dodonna, Captain Syndulla, and what remained of their forces then retreated following Ezra's return with forces from Clan Wren, who executed a strike to destroy the remaining Interdictor. Despite the Bendu's attacks, the Massassi group and what remained of Phoenix Squadron were then able to escape the blockade. Together they went to Yavin 4.

Mission to the Ring of Kafrene
In 0 BBY, Cassian Jeron Andor traveled to the Ring of Kafrene.

Extraction of Jyn Erso on Wobani
Members of the Massassi group then participated in the Liberation of Erso from Imperial Detention Center & Labor Camp LEG-817 on Wobani.

Members
The Massassi unit, as one of the largest rebel cells in the galaxy, had many members. Known personnel included:

Ships

 * Braha'tok-class gunships
 * Orion&dagger;
 * CR90 corvettes
 * Vigilant&dagger;
 * EF76 Nebulon-B escort frigates
 * Vanguard&dagger;
 * 1 Sheathipede-class transport
 * Phantom II
 * Taylander shuttle
 * Chandrila Mistress&dagger;
 * 1 VCX-100 light freighter
 * Ghost
 * 1 YT-1300 light freighter
 * Millennium Falcon
 * BTL Y-wing starfighters
 * BTL-A4 Y-wing assault starfighter/bombers
 * Gold One&dagger;
 * UT-60D U-wing starfighter/support crafts
 * Bravo One
 * LMTR-20&dagger;
 * T-65B X-wing starfighters
 * Blue One&dagger;
 * Red Five
 * T-65C-A2 X-wing starfighters