Mezue ahịrịokwu na-esonụ: Iji jiri ohere Ferdinand nwere maka nnupụisi Bohemia ná mmalite Agha Afọ Iri Atọ ahụ mee ihe, Bethlen wakporo Alaeze Hungary nke ndị Habsburg na-achịkwa na 1618 ma merie ya kpam kpam ruo 1620. Ọ bụ ezie na e mere udo na Jenụwarị 1620 na-enye Bethlen 13 counties na ọwụwa anyanwụ Royal Hungary, nwa eze ahụ maliteghachiri agha na Septemba. Ferdinand meriri ndị Bohemia n'agha
Agha White Mountain na Nọvemba nyere ya ohere ilekwasị ndị agha ya anya na Bethlen, na eze ukwu ahụ nwere ike weghachite ọtụtụ ndị Royal Hungary site na 1621. Ebe ọ bụ na Bethlen ekesaaraghị ndị Protestant ibe ya ihe onwunwe ndị a napụrụ ndị isi ndị Katọlik dị ka o kwere ná nkwa, ha kwụsịrị ịkwado ya. Ihe ndọghachi azụ ndị a, nakwa enweghị nkwado Bethlen site n'aka Alaeze Ukwu Ottoman, mere ka Bethlen na Ferdinand chọọ okwu na Nikolsburg.