Thank you, that's really helpful! About the marching speeds, how long do you reckon it would take Paulinus' legions in Anglesey to arrive at London? I calculate the distance to be about 260 miles, but it might be different as I'm using modern roads and not Roman ones. I assume they went down Watling Street from Wroxeter onwards. Also, how long would it have taken messengers to reach Paulinus? I think this would be quicker as it would have been a cavalry rider who could get fresh horses every fort. Another thing I've just thought of (sorry about this!) - cavalry would have ridden British horses, wouldn't they? I think the type of horse used back then would be like one of the Fell/Dales ponies. Or am I wrong? Thanks for all your help!