Poland seems like the "invisible" party during the Seven Years' War Ostensibly, it was fought between France, Austria, and Russia on one side, and Prussia, plus Great Britain-Hannover on the other.
Yet Poland was actually quite "involved," willy-nilly.
- King Augustus III of Saxony was also the elected King of Poland in a "personal union.
- In order to attack Prussia, Russian troops had to cross Polish territory (modern Latvia and Lithuania to get to East Prussia, and Pomerania to get to Brandenburg).
The trigger event was Frederick the Great's occupation of Saxony in 1756.
Did this constitute an attack on Poland that started an undeclared war between Prussia and Poland? Did Russian soldiers cross Poland with the blessing/invitation of Augustus III? Did the Russians "officially" justify their entry into Poland in terms of rescuing Saxony (and protecting Poland) from Frederick the Great? If it had won the war, Russia planned to seize East Prussia and exchange it to Poland for other considerations: Did Russia proffer this to Poland in exchange for passage?
Are there any records or writings about how the Polish government (or its leaders) felt about these issues? Why didn't they take a more active role by e.g. declaring war on Frederick the Great on behalf of their Saxon king?