Those M&D words: Forks of Brandywine

[Ya Sam]

Is it a town, a village? Google gives only the eponymic Presbyterian Church. 
Why 'forks', because of a bifurcating river or road ?

'Whilst they rode whooping and shooting upon Philadel­phia, the Surveyors 
were out in the Forks of Brandywine, well south of the Invasion Route, with 
a new observatory up, and the Stars nimbly hopping the Wires for them, as 
they gaz'd from someplace here upon Earth's Surface, ... '

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