Unit 1 was docked and unoccupied.  Unit 2 operated under power and struck Unit 1's bow, tearing off the bow pullpit, bending the anchor and causing damage to the stern of Unit 1.  Unit 2 was at fault because the captain could not control his vessel.  I did not charge due to extremely strong falling tide and strong winds.  Accident occurred 4-9-2010 approx. 2000.