The Clone Wars
This page is about the projectile weapon. You may be looking for the Clone Trooper by the same name.
Proton cannon

A Separatist proton cannon, armed with flak cells.

"This flak is heavy!"
―A Shadow Squadron pilot during the battle of the Kaliida Nebula[src]

Flak was a projectile weapon that was often used by ground forces to attack aerial units. During the Clone Wars, the Confederacy of Independent Systems utilized Proton Cannons armed with flak cells as ammunition to defend their besieged worlds against Republic invasions, such as the second battle of Geonosis. It was also used by the Malevolence, the massive warship of General Grievous, in space battles to rip apart the enemy vessels.