The Grenadier unlocks at HQ level 16. He is a big and powerful ranged unit that deals area damage – but rather inaccurately!
Its accuracy improves the closer he is to its target, so if you want the Grenadier to destroy something more quickly, Flare him close to it. But keep in mind, if you flare them too close to their target, they might damage each other due to the splash damage of their grenades.
If you attack with only Grenadiers you will have to be careful to avoid running out of time! If you combine Grenadiers with other troops you need to b e careful about them in front of him, as they might get caught in friendly fire!