RedactedNarrative: On 06/24/2918 at approx 1300 hrs. on Dale Hollow Lake in Clay Co. TN in the dock area of Willow Grove Marina, I observed a houseboat( V1) (TN 0425 E) being operated and attempting to be docked. The Operator was heading in an easterly direction with the wind at an easterly direction also. When the operator turned the bow of V1 in a southerly direction to pull into a slip on "D" Dock, it appeared that the wind then caught the large profile of the vessel and began pushing V1 sideways towards the "H" Dock(east).  The operator put the vessel in reverse at high RPM.  The crosswind continued to  catch the profile of the V1 and push it east.  The operator appeared to put the V1 in forward at high RPM , heading south towards "D'' Dock,  as the vessel continued to "crab" towards the east, the operator again went to high RPM in reverse and then with the bow of V1 headed towards the slip on "D" Dock, put his vessel in forward at high RPM.  The port  side towards the stearn but past midship then struck a pontoon boat (V2) (TN 0056 RZ) which was moored to the walkway at "H" Dock causing some damage to V2.