  The proposed ICAL experiment at INO aims to identify the neutrino mass
hierarchy from observations of atmospheric neutrinos, and help improve the
precision on the atmospheric neutrino mixing parameters. While the design of
ICAL is primarily optimized to measure muon momentum, it is also capable of
measuring the hadron energy in each event. Although the hadron energy is
measured with relatively lower resolution, it nevertheless contains crucial
information on the event, which may be extracted when taken concomitant with
the muon data. We demonstrate that by adding the hadron energy information to
the muon energy and muon direction in each event, the sensitivity of ICAL to
the neutrino parameters can be improved significantly. Using the realistic
detector response for ICAL, we present its enhanced reach for determining the
neutrino mass hierarchy, the atmospheric mass squared difference and the mixing
angle theta23, including its octant. In particular, we show that the analysis
that uses hadron energy information can distinguish the normal and inverted
mass hierarchies with Deltachi^2 approx 9 with 10 years exposure at the 50 kt
ICAL, which corresponds to about 40% improvement over the muon-only analysis.
