Sentence:  The police were kept out of sight, and the amusements of the mob consisted chiefly in forming bodies which rushed from one end of the Park to the other, to the great injury of other rioters; or in hunting or "<WSD>chivvying</WSD>" any footman or remarkable person who should venture among them; some of these unfortunates were much injured. 
Meaning of the word marked with <WSD> tags:  To pursue as in a hunt. (from mid 19th c.)