While unmatched in formation combat on an open field, Phalangites and Hoplites do not fare well in constrained spaces and rough terrain. Thorakites are the answer to these problems. Trained to a higher physical standard, but without the rigid formation and drill of the phalanx, Thorakites allow an enterprising commander to exploit gaps and developments on the battlefield that the traditional phalanx would be too cumbersome to address.