Sentence:  He did not hesitate what to do. It would be <WSD>prudent</WSD> to continue on to Omaha, for it would be dangerous to return to the train, which the Indians might still be engaged in pillaging. 
Meaning of the word marked with <WSD> tags:  Sagacious in adapting means to ends; circumspect in action, or in determining any line of conduct; careful, discreet, sensible; &mdash; opposed to rash; directed by prudence or wise forethought; evincing prudence