OK, let's start something.........
Think of the BF as being commanded by the Grand Old Duke of York.
They went to Arras out of political expediency or perhaps out of a sense of nostalgia having spent several years there in the first war.
So maybe they wanted to call it the British Expeditious Force?
And when they were there they were there. And when they were back they were back and when they were only halfway there they were getting the snot bombed out of them at Dunkirk.
Role? You asked for a role?
Beats me!
