R.I.P. Scout26
The limitations of the poll are vexing. First I'd argue that Rommel and Washington never posed a threat to Britain itself, only its fighting men.
Funny, the Angles and Saxons were "germans" and a lot of the "Anglish" language consists of german words.
I'd go with bonaparte. If he could have made it over the channel, no more Britain as we know it.Those wars lasted a long time, plus produced some of Britains greatest hero's, Wellington and Nelson.A couple generations of men fought napolean and company, not just one.Plus, he was short and french.
Napoleon did lose every time he faced a British army, so its a bit much to say he would have beaten us if he could have got across.
Now if Washington had come over there, you'd all be speaking English right now.