Massacre near Teralov

En route to provide supplies to the people of Teralov, a squadron of A-wings and a transport affiliated with the rebellion were attacked by the Galactic Empire. An Imperial light cruiser dispatched three TIE interceptors led by Captain Vult Skerris which quickly wiped out the rebel fighters. Despite the crew of the transport surrendering, Skerris destroyed the ship.

Prelude
Two years before the Battle of Yavin, the planet Teralov experienced a famine. The rebellion decided to send a relief transport to aid the people of Teralov. This transport was escorted by six A-wing starfighters. The transport's pilot was contacted via hologram by a woman who thanked the rebels for their aid.

The attack
Before the rebel convoy could proceed further, an Imperial light cruiser emerged from hyperspace and dispatched three TIE interceptors which engaged in a dogfight with the rebel A-wings. After wiping out the A-wings, the fighters proceeded to strafe the rebel transport; damaging the transport. The pilot pleaded over the com for the Imperials to spare them because they were an unarmed transport. However, the Imperial Captain Vult Skerris disregarded his pleas and fired a final burst into the transport's bridge; destroying the ship and killing all aboard.

Aftermath
The destruction of the rebel convoy near Teralov was a major blow to the rebellion. Some rebels like Ezra Bridger lamented that the rebels were losing pilots at a faster rate than they could replace them. However, the Imperial action disconcerted several Imperial cadets at the elite Skystrike Academy; namely Wedge Antilles, Hobbie, and Rake Gahree. They contacted a rebel agent named Fulcrum who relayed their plight to the Phoenix rebel cell. In response, Hera Syndulla dispatched Sabine Wren on an undercover mission to extract these cadets.

Behind the scenes
The attack near Teralov first appeared in the Star Wars Rebels episode "The Antilles Extraction", which debuted on Disney XD on October 8, 2016.