Which woman used a workman's hammer to put a tent peg in an unusual spot? Where did she put it?

It was Jael who drove the tent peg thru the temple of Sisera and into the ground...

Judges 4:17 thru 21

That's the lady, and she did drive it into the ground, right through the head of Sisera. Judges 4:21,22; 5:26