"What are these feeble Jews doing? (Neh 4:2)" This is ever the question from Israel’s enemies. Having returned from exile, the Jews were rebuilding the wall around Jerusalem.

 So the wall was finished on the twenty-fifth day of the month Elul, in fifty-two days. And when all our enemies heard of it, all the nations around us were afraid and fell greatly in their own esteem, for they perceived that this work had been accomplished with the help of our God.

Nehemiah 6:15-16 (ESV) Bible Gateway link