What does "put up your swords, you know not what you do" mean?

At
the very beginning of Shakespeare's , two servants from the house of
Capulet and two servants from the house of Montague have drawn their swords and have just come
to blows as other members of each family run into the street.

Level-headed ,
's cousin and friend, tries to act as a peacemaker, stepping into the fray in the hopes of
breaking it up.

BENVOLIO: Part, fools!

He beats down their swords.

Put up your swords.
You know not what you do. (1.1.59€“60)

Benvolio is
essentially saying to the combatants, "Stop this right now! What's wrong with
you?...