Sentence:  Now, if you can keep your brother sportsmen in order, and put any discretion into them, you are in luck; they more frequently do harm than good: if it be possible, persuade those who wish to <WSD>halloo</WSD> the fox off, to stand quiet under the cover-side, and on no account to <WSD>halloo</WSD> him too soon ... 
Meaning of the word marked with <WSD> tags:  To chase with shouts or outcries.