  Quantitative investigation on the current-induced torque in antiferromagnets
represents a great challenge, due to the lack of an independent method for
controlling N\'eel vectors. Here by utilizing an antiferromagnetic insulator
with Dzyaloshinskii-Moriya interaction, {\alpha}-Fe2O3, we show that the N\'eel
vector can be controlled with a moderate external field, which is further
utilized to calibrate the current-induced magnetic dynamics. We find that the
current-induced magnetoresistance change in antiferromagnets can be complicated
by resistive switching that does not have a magnetic origin. By excluding
non-magnetic switching and comparing the current-induced dynamics with the
field-induced one, we determine the nature and magnitude of current-induced
effects in Pt/{\alpha}-Fe2O3 bilayer films.
