interjection / noun / verb
wham
WAM/wæm/
A sudden, forceful blow or impact.
Wham, the wrecking ball strikes the brick wall.

Etymology
Wham is an imitation of an impact sound, recorded as a noun meaning a heavy blow. As an interjection, it evokes that sudden impact directly rather than simply naming the blow.
In context
… wham into her with those shields and then hammer into the ground