about midnight
`` Dave 's right , '' said August . `` You ca n't trust a wild mustang any more than a wild horse . '' August was right . Black Bolly broke her halter about midnight and escaped into the forest , hobbled as she was . The Indian heard her first , and he awoke August , who aroused the others . `` Do n't make any noise , '' he said , as Jack came up , throwing on his coat . `` There 's likely to be some fun here presently .