Sons of Mars

Legionaries from the Gallic wars.
They're all wearing lorica hamata, except the centurion and the guy at the left of him. They're wearing lorica squamata, or scale armor.
The helmets are Montefortinos and Coolus, all made of copper alloy. The alloys of copper back then were not as homogeneous as today, so the material of the helmet could vary from proper bronze to in reality some form of brass. I tried to represent this by giving some helmets different tones of yellow.

The only iron helmet is the one of the centurion, who is using an Agen helmet. During the Gallic wars the romans started (mostly officers first) to use and copy gallic designs like they did before with the Montefortino (the Coolus was some sort of evolution/improvement of the Montefortino). This iron helmets copied by the romans during the Gallic wars were the first steps into the development of the Imperial Gallic helmet, wich is the iconic roman helmet that we all know and love.

The centurion with his bronze squamata, his greaves, and the iron helmet with the transversal crest really stands out from his soldiers. He has a more expensive equipment than the rest of the legionaries, because he is wealthier.