The neckbeards have 50 1oz hollowpoint slugs and 50 rounds of ten pellet 0000 buckshot.
The romans are armed with body armor, shields and short swords along with some spears.
The neckbeards have a 7x7 meter 3 story bamboo castle in the middle of a Wal-Mart parking lot that the Romans are trying to take by force.
Romans, we're talking about career soldiers. First they would strategize and decide on tactics and probably flank the castle chopping down supports while using the spears as cover. Also is it likely they try to burn the castle.