The firebat's attack is optimized against groups of small-sized units, as it deals concussivesplash damage. Firebats are most useful in the early game, as all of the base units for the three races are small. Supported by medics, firebats can stand up to zealots despite the large difference in health between them. With stims and medics, firebats can easily defeat swarms of zerglings. Unlike marines, firebats cannot attack air targets.
The firebat's attack is ranged, but it still works under the defiler's Dark Swarm. The attack also deals full damage against protossshields, regardless of the size of the unit.