a spent force

:  used up :  consumed

:  exhausted of active or required components or qualities often for a particular purpose

:  drained of energy or effectiveness :  exhausted

:  strength or energy exerted or brought to bear :  cause of motion or change :  active power

: used with a number to indicate the strength of the wind according to the Beaufort scale

:  moral or mental strength

:  to do violence to

:  rape

:  to compel by physical, moral, or intellectual means