A powered hammer assembly includes a powered hammer including an output shaft and an axial impact mechanism. The assembly also includes an attachment including an impact portion defining a first axis. The impact portion is fixed to the body and is immovable relative to the body. The impact portion is configured to receive repeated impacts from the powered hammer. The attachment further comprises a receiving portion in which a rod to be driven into the ground is receivable. The clamping portion defines a second axis that is parallel with the first axis.