  The triangular spin lattice of NiBr$_{2}$ is a canonical example of a
frustrated helimagnet that shows a temperature-driven phase transition from a
collinear commensurate antiferromagnetic structure to an incommensurate spin
helix on cooling. Employing neutron diffraction, bulk magnetization, and
magnetic susceptibility measurements, we have studied the
f\hspace*{.5pt}ield-induced magnetic states of the NiBr$_{2}$ single crystal.
Experimental f\hspace*{.5pt}indings enable us to recapitalize the driving
forces of the spin spiral ordering in the triangular spin-lattice systems, in
general. Neutron diffraction data conf\hspace*{.5pt}irms, at low temperature
below T$_{{\rm m}}$ = 22.8(1) K, the presence of diffraction satellites
characteristic of an incommensurate magnetic state, which are symmetrically
arranged around main magnetic reflections that evolve just below T$_{{\rm N}}$
= 44.0(1) K. Interestingly, a f\hspace*{.5pt}ield-induced transition from the
incommensurate to commensurate spin phase has been demonstrated that enforces
spin helix to restore the high temperature compensated antiferromagnetic
structure. This spin reorientation can be described as a spin-flop transition
in the (\hbox{$a$--$b$}) basal plane of a triangular spin lattice system. These
f\hspace*{.5pt}indings offer a new pathway to control the spin helix in
incommensurate phases that are currently considered having high technical
implications in the next-generation data storage devices.
