> Roman soldiers fought in a checkerboard formation, with the front line engaging the enemy, then cycling to the back to rest while the next line moved forward.

> Roman soldiers fought in a checkerboard formation, with the front line engaging the enemy, then cycling to the back to rest while the next line moved forward. This rotation system allowed Romans to maintain constant pressure while preventing fatigue. The first thing that comes to mind is StarCraft2 Stalker blink micro. They have shields that regenerate over time, so the front wave fights until shields are low then fall back to recharge. The 2nd part is also covered by general SC2 tactics, concave fronts increase attacking numbers more than convex defenders'.