Hi, Paul Roberts, first welcome to the ROP Forum.
I suggest that you try to get some books about the SYW to get more insight in what happened at that times and about the main goals of both sides.
Above all I can tell you that the main goal of the Prussian was to survive an enduring campaign of warfare and holding its property like Silesia which was a very rich province in resources and commerce.
The main goal of the Austrian Coalition was to regain Silesia from the Prussian and to reduce the Prussian Kingdom to the core holding of Brandenburg so that Austria became the superior power of the Holy Roman Empire and that Prussia could no longer threaten and question his power.
That is all sofar I understand the reason for the SYW.
Frederic the Great had no other chance than to do a pre-emptive strike against the growing enemy coalition. He saw a need in the occupation of Saxonia as a main supply resource and as a possibilty to gain more ground against Austrian operations. Most of the Battles during the SYW happened in Saxonia and Silesia and Bohemia. Only Kunersdorf and Zorndorf and some I forgot happened on Prussian core grounds.
Two times in the war Berlin was heavily threatened by enemy troops, the last threat was a very serious one as the Russians destroyed the depots, the manufactories and gain a modest loot there.
Frederic was possibly never able to threaten Vienna like Berlin was threatened, but often enough he hold and gain ground against the enemy coalition.
If the Russian Empress Elisabeth had not died around 1761/62 the war would have ended with the fall of the Prussian Kingdom, but by that event Prussian could renew some of his forces and hold ground against Austria.
The last main Battle in the SYW was the Battle of Freiberg where Prussian Forces under the command of Prince Henry, the younger brother of Frederic, defeated a superior coalition force and decided the fate of Saxonia and even the outcome of the war.
Sofar my personal insight and view of the SYW. I hope I was helpful...
R.I.P. Henry D.
In Remembrance of my Granduncle Hans Weber, a Hungaro-German Soldier,served in Austro-Hungarian Forces during WWI,war prisoner, missed in Sibiria 1918...