 Complete the following phrase:  Each individual hoplite carried his shield on his left arm, protecting not only himself but also the soldier to the left. This meant that the men at the extreme right of the phalanx were only half-protected. In battle, opposing phalanxes would try to exploit this weakness by attempting to overlap the enemys right flank. It also meant that, in battle, a phalanx would tend to drift to the right as hoplites sought to remain behind the shield of their neighbor. Some groups, such as the Spartans at 