Maybe you can train a Seagull to be your guard? This Limited Edition item was available for 15000 c from May 13-20, 2010 and gave 150 xp when bought. This item was re-released from August 11-25, 2011. The description reads "In support of the red knight."
Clicking the tower will cause the red flag to start flapping silently, as if it was stirred by a breeze.