Joshua 6

You shall march around the city, all you men of war; you shall go all around the city once. This you shall do six days.  And seven priests shall bear seven trumpets of rams’ horns before the ark. But the seventh day you shall march around the city seven times, and the priests shall blow the trumpets. vv.3-4

Read chapter 6
This is not your typical siege: no warlike preparations were made.  As Israel is preparing to take down Jericho as God commanded, it was the people of Jericho that shut themselves in.  Jericho, a city that flourished with art and nature, locked themselves up so-to-say not wanting to believe the reality of their destruction and judgment of God.  Israel's tactic wasn't to intimidate the people of Jericho with all their weapons of war rather their symbol was carrying the ark around the city in silence- this showed that this victory was of God- and sound trumpets at the final march on the seventh day that seems more like getting ready for a festival than a battle.  This wasn't a siege that lasted for years or even months to make the people starve, it only lasted seven days.  It seems a very absurd thing the people of Israel were to do: walk around the city walls once a day for six days and then seven times on the seventh day.  Benson's Commentary suggests this was of God, "that they might learn to take new measures of things, and to expect success, not from their own valor, or skill, but merely from God’s appointment and blessing; and in general, not to judge of any of God’s institutions by mere carnal reason."
I always wondered how big this city was for this to be possible, at least to walk around a city seven times.  Yet these long marches around the city were to deepen the impression of God on those in Jericho as well as I'm sure it made a deep impression on the Israelites as well of Jericho their enemy.  How has God taken you on a seemingly ridiculous route or task of His promises that you might learn to lean on God in a new way?