Napalm would be good for anti GV and troops roll also for destroying the towns.
Incendiary bombs, also known as firebombs, were used as an effective bombing weapon in World War II [1]. The large bomb casing was filled with small sticks of incendiaries (bomblets), and designed to open at altitude, scattering the bomblets in order to cover a wide area. An explosive charge would then ignite the incendiary material, often starting a raging fire. The fire would burn at extreme temperatures that could destroy most buildings made of wood or other combustible materials (buildings constructed of stone tend to resist incendiary destruction unless they are first blown open by high explosives).