In general, the French descend on England's capital (3)

I believe the answer is:
lee
'in general' is the definition.
'lee' can be an answer for 'general' (Robert E. Lee - US revolutionary commander). I am not sure about the 'in' bit.
'the french descend on england's capital' is the wordplay.
I cannot quite see how this works, but
'england' could be 'e' (short for England) and 'e' is found within the answer.
'the french' could be 'le' ('the' in French) and 'le' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for lee that I've seen before include "The sheltered side - of Cork's river?" , "Confederate general" , "Cork river" , "The side that's sheltered from the wind" , "Bruce ___, martial arts ace" .)
