Guerrilla warfare

Guerilla warfare, also known as guerilla tactics, is a form of irregular warfare where a small group fights off a larger force via unconventional tactics. Strategies falling under guerilla warfare include ambushes, sabotage, raids, and hit-and-run tactics. In extreme cases, guerilla warfare can even utilize borderline terroristic measures such as holding hostages. Largely because of the fact that guerilla warfare was technically not part of the standards of warfare, it was generally used by terrorist groups, revolutionaries, outlaws, or people who have been pushed to their limit, although in some cases, even larger groups can engage in it regarding special forces. Those who practiced such tactics were generally called guerillas.

Usage
During the Clone Wars, the Republic proceeded to aid and train various guerilla groups via the Jedi, including the rebels on Onderon. During this event, Obi-Wan Kenobi agreed to help train the Onderon rebels in their fight against Sanjay Rash, but made clear that they won't fight their war for them. The Onderon rebels, including Saw Gerrera, being trained by the Republic would later come back to haunt their successors, the Galactic Empire, later on when they became members of the Partisans who operated at Jedha City on Jedha until it was destroyed by the Death Star.

In 18 BBY, the militias of the planet Salient II utilized guerilla warfare against the Empire, although this ultimately failed.

The Death trooper squads also had knowledge of guerilla tactics, due to their being trained on Scarif. The member DT-5537 demonstrated this knowledge during the Battle of Scarif.

The Rebel Alliance unit Pathfinders utilized guerilla combat as a means of infiltration.

Appearances

 * Rogue One: A Star Wars Story
 * Rogue One: A Star Wars Story novel
 * Star Wars: Episode VI Return of the Jedi
 * Catalyst: A Rogue One Novel
 * Catalyst: A Rogue One Novel