My long-term ally, Macedonia, is being invaded by Getae on a large scale. The Macedonians have had some significant victories against somewhat larger Getae stacks in terms of visible stack size (the banner and the color fillling), which I guess is easily explained in terms of superior unit quality of Hellenes.
Now, however, I witnessed the Macedonians doing what looked like a suicide attack, pitting a no-color stack against one with at least one third of full strength. The Macedonians won, and the Getae retreated with reduced numbers. There were other units of both factions around, so I had something to compare against. I am pretty sure that the Macedonian "stack" was nothing more than one or two units. Have you seen something like that? Are there some super units that can alone dispatch a much greater enemy force? I think I had full visibility of the area due to an agent of mine, and I find it unlikely that they were assisted by a second unit in an adjacent square.