Sentence 1: The Fighter Escadrille was at the beginning of the Second World War a unit of the Polish Air Force , which was attached to the Łódź army .
Sentence 2: At the beginning of the Second World War , the Fighter Escadrille was a unit of the Łódź army , which was attached to the Polish Air Force .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?