Sentence 1: One ship , the `` Warrnambool '' class corvette HMAS `` Bathurst '' , was sunk during these operations .
Sentence 2: A ship , the `` Warrnambool '' class Corvette HMAS `` Bathurst '' , was sunk during these operations .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?