Sentence 1: 162 . Fighter Escadrille was a unit of the Łódź Army at the start of the Second World War . The unit was attached to the Polish Air Force .
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?