This is a Battle Engine for a topview Game. You have to 2x click on the green Flag to start. To command a Unit, press the smal picture, then click on the symbol. The Shield means testudo,the Flag means where your Troops should. If you click at the destination, the legionarys will go there. If the symbol touches the enemy, and you click there, your Troops will follow the enemys. If you click on the sandals, the Troops will walk with 2x speed. To change your choice of Unit, click on th choosen Unit, and then click on your new choice.
It's basicly like a Total War Battle.