Possible Clues:

• What's on the breakfast menu isn't one for the soldiers?
• Serving soldiers meet with resistance?
• Cooked food takes age with hob and griddle broken
• Bighead lodger's cooked breakfast?
• Soldiers can't enter this tricky swamp -- one went first, as an example, being swallowed up
• Possible picnic item
• Cooked item provided by 1 down
• Callous urge one may get at a picnic
• Breakfast choice
• Food soldiers won't tuck into