Conversation so far:
What conflict did Charles V. Holy Roman Emperor have with the Ottoman Empire?
Charles V, Holy Roman Emperor fought continually with the Ottoman Empire. The defeat of Hungary at the Battle of Mohács in 1526 sent a wave of terror over Europe.“

Question: Why did it send a wave of terror over Europe?
Self-contained rewrite: Why did the Battle of Mohacs in 1526 send a wave of terror over Europe?