After three days; either,
1. At the end of the three days mentioned Joshua 1:11, or upon the last of them, as this phrase is used. See Poole on "Deuteronomy 16:1". Or,
2. After those days were expired. See Poole on "Joshua 1:11". The officers went through the host the second time to give them more particular directions, as they had given them a general notice, Joshua 1:10,11.