 Complete the following phrase:  In the years following Cannae, striking reforms were introduced to address these deficiencies. First, the Romans articulated the phalanx, then divided it into columns, and finally split it up into a great number of small tactical bodies that were capable, now of closing together in a compact impenetrable union, now of changing the pattern with consummate flexibility, of separating one from the other and turning in this or that direction. For instance, at Ilipa and 