André Geraque Kiffer 
Naval Battle Of Actium, September 2nd, 31 Bc [PDF ebook] 

Drawing on the technical features of having heavier ships rigged with masts and sails, Antonius and Cleopatra s fleet could have sailed into Agmen (column) to a safe distance that left the enemy in doubt as to their battle order, and at the last possible moment formed a large Orbis (yes, a square similar to the tactical terrestrial formation, but without spaces inside) and like a ruptured ram ahead and then sailed towards Egypt – with hoisted sails – like a large convoy.