Possible Clues:

• Entering mountain pass see solitary officer
• Dog that is dispatched to protect single officer
• Mustard or Sanders
• Officer's some guts approaching centre of enemy line
• Officer, one taking line south of mountain pass
• Officer's pass — what general has, not field marshal?
• Elvis manager ___ Tom Parker
• Sporter of an eagle insignia
• Mustard, in a game
• Dog that is left to protect a certain military commander