Related Clues:

• Sent smoke signals, maybe
• Tipped off
• Warned
• On one's toes
• Gave a heads-up to
• On guard
• Let know
• Cautioned
• Made aware
• Forewarned
• Notified of danger
• Put on guard, forewarned
• Related about warning notified
• Put on guard, warned
• Altered, having been put on guard