Yet another Ancient Roman variation of "The Tesudo", The Half-Circle Formation was a tactic designed to provide a form of portable "Fort", for advancing Infantry (without proper protection). Used to distract an Enemy while The Roman Main Line properly "aligned", The Half Circle Formation could be small or large. Normally shaped as a semi-circle, it was "open" at the Rear and Top. This also afforded for Retreat, if needed. For Defense, the Front Rank would extend their Spears forward to impale any unwary Enemy. The Half Circle Formation was often deployed with other related "Shield" maneuvers. It still is used in form today by many Nations Law Enforcement Agencies in Urban Pacification Techniques.