What does a breach of peace mean?

Question

What does a breach of peace mean?

Answer 1

"*Once more unto the breach, dear friends, once more;?"

A breech is an opening in a walled city, were the enemy has breeched your defenses. So you breeched or broke the peace,

*Henry V

Answer 2

Yelling, playing a car stereo at ear drum breaking levels... usually a noise complaint.  Can also apply for a protester if they're not blocking traffic but still causing a disturbance by their presence in a certain area.  

Answer 3

Like if you were out on the street shouting your head off, causing a distubance and so on