Well, first I thought about was this one: During his Gallic Wars, Julius Caesar invaded Britain twice, in 55 and 54 BC.[1] The first invasion, made late in summer, was either intended as a full invasion (in which case it was unsuccessful - it gained a beachhead on the coast of Kent but achieved little else) - Wikipedia Little is really known about any battles, except that the tribune sent there really didn't dare make an expansion there, so a Briton campaign with some tribal war, then ending with kicking the Romans back on their boat, could easily be swallowed as historical enough. The article on Wikipedia is quite good, with quotes from different historical sources. I thought about the first invasion in 55 BC. Now, this is getting interesting. Unfortunately, the Britons lost in the long term due to poor management, but they were certainly fierce warriors, and offered much resistance. With some imagination... I've been planning what I call "Koinon Hoplitai," meaning something like "Common Soldiers" in Koiné. It will revolve around the history of Hoplites, from the peak of Corinth (800BC), until Roman domination over Greece. I planned quite much for each city state (+ Persian Wars), but I won't include the quest of Alexander the Great, since it was out in the far East. I will include what was going on in Greece at that time, though. Sorry, my fault. I thought about that the Spartans sent a "delegation," but that was to support the Ionians. Or something along those lines.