Flow past a bluff body creates vortex shedding,which causes a periodic force. This periodic force may threaten the structural integrity of the body if the frequency of shedding matches the natural frequency of the body. Apart from this type of vortex-induced vibration, a considerable drag force acts on a bluff body due to the presence of a wide wake. This drag force is Reynolds number (Re) dependent. Few researchers have shown that three-dimensional control was more effective in reducing drag and cancelling shedding compared to two-dimensional forcing. We are interested to know how the vortices generated by a three-dimensional forcing interact with the mean flow and how these perturbations affect the primary instability in the wake.