deadly tent pegs

Chapter 4 highlights a couple of women who did God's work. Interesting how Barak had to lean on Deborah's strength to have confidence in beating the Canaanite army. On top of that he got the final kill of Sisera taken away from him by a woman (with a tent peg!). Some serious demasculinization goin on. I guess that's what he gets for doubting God's Word.
What's the lesson here? Don't trust a woman with a tent peg!