These are the next two of Vegetius' seven instructions regarding layout before battle.
3. The same as number two, except that the left wing is made stronger and attempts a turning movement and is to be tried only when it is known that the enemy's right wing is weak.
4. Both wings advance together, leaving the center behind. This may take the enemy by surprise and leave his center exposed and demoralized. If, however, the wings are held, then this is a hazardous movement, since the army is now split into three seperate formations and a skillful enemy could turn this to their advantage.
"Roman Army Tactics." The Roman Empire. Web. 23 Mar. 2010.
http://www.roman-empire.net/army/tactics.html.
Wing. Digital image. Wikimedia Commons. Web. 6 Apr. 2010.
http://upload.wikimedia.org/wikipedia/commons/2/22/Wing.jpg.
