After the accession of Maria Theresa of Austria to the Kingdoms of Bohemia and Hungary, Frederick II saw an opportunity to invade and annex the province of Silesia (then under the Czech Crown). He took Silesia by storm and occupied almost the entire province. His troops settled into winter quarters and were expecting an easy land grab, but Maria Theresa sent an army of about 20,000 men led by Wilhelm Reinhard von Neipperg to take back the province and assert herself as a strong monarch.