Tank. Heavy cannon deals heavy damage.
Offensive: Cheap, long range tank capable of punching enemies at a distance and with such a fast recharge combined with low production cost allows this unit to be a bit spammy. Requires an armored escort for better results.
Defensive: Slow as hell and sporting a low armor rating makes the hammer a very weak tank in terms of combat prowess meaning it's more likely to be decimated by another tank that has both better armor and firepower than itself. Avoid this forming groups as it can be problematic.
Their are three variants of the hammer including the Scimitar I which has 30+ more armor than the hammer and the Achilles being slightly more expensive.