'Middle' in the Bible

So Gideon and the hundred men who were with him came to the edge of the camp at the beginning of the middle watch, when the guards had just been changed, and they blew the trumpets and smashed the pitchers that were in their hands.

Samson took hold of the two middle [support] pillars on which the house rested, and braced himself against them, one with his right hand and the other with his left.