Charles McTiernan, of South Carolina has found a Col. Pat Tiernan 
that was on George Washington's Staff at Yorktown. 

John C. McTiernan of the (Albany) Little Falls, NY Line stated that 
a soldier by the name of Tiernan was in the boat with George Washington 
when he made the famous crossing at the Delaware River. Other research 
by Charles McTiernan from SC. states that this (Mc)Tiernan was rebuked 
by Washington for not having his entrenchments built on time. This is 
detailed in the famous portrait entitled "Washington before Yorktown",