A Gorn attack on the human colony of Parnassus Beta, during which the USS Cayuga was destroyed, colonists and Enterprise officers were taken captive, and Starfleet ordered a withdrawal.
Parnassus Beta was a settlement just outside Federation territory, built to resemble a small town of the American Midwest. Captain Marie Batel's USS Cayuga was helping the colonists when the Gorn struck, jamming communications and wrecking the ship in orbit.
The attack is shown in Hegemony, the finale of the second season of Strange New Worlds. The Enterprise arrives to find a Gorn line of demarcation drawn through the system. Pike leads a covert landing party past Gorn hatchlings, finds Batel alive but implanted with Gorn eggs, and meets a stranded engineer, Montgomery Scott. Spock and Chapel bring down the Cayuga's saucer to destroy a Gorn jamming tower.
The Gorn then beam away survivors including La'an, Ortegas, M'Benga and Sam Kirk, and Starfleet orders Pike to retreat. The story continues in Hegemony, Part II.