  The large CALICE Digital Hadron Calorimeter prototype (DHCAL) was built in
2009 - 2010. The DHCAL uses Resistive Plate Chambers (RPCs) as active media and
is read out with 1 x 1 cm2 pads and digital (1 - bit) resolution. With a world
record of about 0.5M readout channels, the DHCAL offers the possibility to
study hadronic interactions with unprecedented spatial resolution. This talk
reports on the results from the analysis of pion events of momenta between 2 to
60 GeV/c collected in the Fermilab test beam with an emphasis on the intricate
calibration procedures.
