The superior forces of the Lombard League…
May 1176 CE
The superior forces of the Lombard League finally deal the emperor a disastrous defeat on May 29, 1176 at the Battle of Legnano, deploying pikemen and cavalry to crush the mounted German knights; Frederick, wounded and for some time believed to be dead, flees in disguise.
This battle marks the turning point in Frederick's claim to empire.
He has no choice other than to begin negotiations for peace with Alexander III and the Lombard League.