Sentence:  I have read in some old marvellous tale, / Some legend strange and vague, / That a midnight host of spectres pale / <WSD>Beleaguered</WSD> the walls of Prague. // Beside the Moldau's rushing stream, / With the wan moon overhead, / There stood, as in an awful dream, / The army of the dead. 
Meaning of the word marked with <WSD> tags:  To besiege; to surround with troops.