The city of Jericho was a fortified city, Thick, heavy walls of brick and mortar on all sides. They had undoubtedly in the past, met other kingdoms that had attempted to either scale their walls or bring them crashing with a military-style attack without success.
God gives Joshua and the children of Israel an unorthodox approach to bringing down Jericho. For six days they were to walk silently around the city one time a day. On the seventh day, they were to walk around the city seven times. After the seventh time, the priests would blow their horns and then all the people would shout and the wall would fall down flat! I imagine Joshua giving God’s plan to the people and them looking around scratching their heads because it just doesn’t seem like the pragmatic way to approach this problem.
However, God’s ways are not our ways, In fact, God’s ways are often contradictory to pragmatism. All through the bible people of faith achieve the will of God in ways that would seem unorthodox to the world. That’s why it is so important to be in God’s word and learn how God operates because it a lot of times is contradictory to how the world operates.
It was vitally important that Israel keep themselves from the cursed things of Jericho. God wants to keep his people pure from the wicked things of this world.
So Israel believed God and followed his instructions. and at the right time, they yelled their shouts of faith and the wall did fall. All of Jericho was destroyed besides Rahab the harlot, who was saved with her family as promised.