As a bit of mood setting for painting Romans I'm rereading The Eagle in the Snow by Wallace Breem.
Here's a sample:
The cohorts marched out by night, carrying full equipment, twenty days rations and the hopes and fears of their commanders.
This is, I think my third reading of this stirring epic of the last Roman general holding the crumbling frontier against the coming darkness.
I can see the novel making a good campaign game too.