Jamieson, Fausset and Brown on Ezra 10:9-17

9-11. Then all the men of Judah and Benjamin--The returned captives belonged chiefly to these tribes; but other Israelites are also included under these names, as they all were then occupying the territory formerly assigned to those two tribes.

It was the ninth month--that is, between the end of December and the beginning of January, which is the coldest and most rainy season of the year in Palestine.

all the people sat in the street--that is, the court.