The Battle of Carrhae, 53 B.C. After being informed of the presence of the Parthian army, Crassus panicked. His general Cassius recommended that the army be deployed in the traditional Roman fashion, with infantry forming the center and cavalry on the wings. At first Crassus agreed, but he soon changed his mind and redeployed his men into a hollow square, each side formed by twelve cohorts. This formation would protect his forces from being outflanked, but at the cost of mobility.