Hahaha, as if I'll guess!
I haven't a spare one anymore as well, I started making one but my drawing skills let me down

But damn!!
Should have made the link with the dice and Caesar when I thought of Roman soldiers.
Still don't know what it could be.
Caesar did lead his army across the Rubicon when he said alea iacta est, so perhaps that's why the river is red.
Start of the Great Roman Civil War.