By faith the walls of Jericho fell down, after they were compassed about seven days. The walls of Jericho fell down - This is particularly explained Joshua 6:1, etc. God had promised that the walls of Jericho should fall down, if they compassed them about seven days. They believed, did as they were commanded, and the promise was fulfilled.
Related Commentaries of Hebrews 11:30
Hebrews 11:30
30 By faith the walls of Jericho fell down, after they were compassed about seven days.