Possible Clues:

• Deductive
• With good reason, serving American in pub
• Using clear thinking
• Clearly and soundly reasoned
• Rightly reasoning that a piece of wood has little dietary value
• Look at soldier's state, not without reason
• Sound made by soldier entering hostelry
• Sound of US soldier in bar
• Reasonable to find US soldier in pub
• Soldier from the States locked in pub is capable of reasoning