Sentence:  The King, Duke of "York", Prince "Rupert" and "Maurice" are still at "Oxford" closely surrounded by the Parliaments Forces, and the other not well resolving what course to take, all their Horse being about "Faringdon", in expectation of the Lord "Ashley" with his Foot to joyn in a Body, if they be not prevented by Colonel "Fleetwood" and "Rainsborough", <WSD>straiting</WSD> and allarming Oxford very often ... 
Meaning of the word marked with <WSD> tags:  To confine; put to difficulties.