 Complete the following phrase:  As a 7-year-old she married on 7 February 1402 Margrave Frederick IV the Warlike of Meissen 13701428, who in 1425 became the first Elector of Saxony, as Frederick I. The elector lost a large part of his army in the Hussite Wars in a battle in 1425 at Most. During Fredericks absence, Electress Catherine organized another army of 20,000 men, which rushed to Fredericks aid, but was defeated devastatingly in the 