I somehow think this historic event was featured in Asterix & Obelix (though this Roman isn't by Uderzo ). Could be mistaken and just have a picture of Romans dicing in my head And that character... some sort of high Roman military man I imagine Well... they build quite some bridges in their time. And aquaducts. And there is a whole village at Xanten, that's near a river... I bet there are a lot more like that though Is the river meant to be "the Red Sea" or some sort of river of blood?! Maybe the dice is to show the whole expedition was quite a (lucky) gamble? Ok, wild guess here: One of the (3) Punic Wars?! Edit Why are you so sure it's Ceasar Neija?