This is helpful, short of being able to actually watch a game played by those who know what they are doing. (Might be nice to see a well documented AAR with the starter armiers. Hint. Hint.)
I was initially visualizing the enemy rushing forth to smash themselves against the shields of my legions. I'm gathering I need to think about moving to the enemy and the second move is important for this as is the location of the commanders.
So... my initial deployment might look this with the aim of bringing the majority of my army forward to meet the enemy.
In later turns, I might bring back the troop commander to the main line and possibly drop back the Triarii. The evading velites being light foot would most likely pass through everything behind but if they didn't pass all the way through they would simply push back the Triarii.
What is the advantage/disadvantage to keeping support unit glued to the back of the main line troops versus pulling them back?
I keep thinking the Triarii would be handy for doing a 90 degree turn and moving to the flank if the enemy tried to flank with horse mounted troops. Is this a common/good use for the support units?