aug 15, 1619 - The Ottoman Empire Joins the war
Description:
The Ottoman Empire, a common Enemy and rival of the Holy Roman Empire, finds an easy way to weaken the Hapsburg Family. They start sending supplies to Bohemia because the Ottoman(who are Muslims) wants an end to Catholicism just as much as the Protestants do. One section of the Ottoman start to engage combat against the HRE and they have surrounded the Hapsburg states of the HRE.
Added to timeline:
30 year war timeline
Date: