Joshua 1:1–18 is almost entirely taken up with dialogue. Dialogue concerns conversations that take place between two persons.
A helpful division of Joshua 1 is as follows:
The commissioning of Joshua (Joshua 1:1–9)
Joshua’s orders to the officers (Joshua 1:10–11)
Joshua’s orders to the Transjordanian tribes (Joshua 1:12–15)
Confirmation of Joshua’s leadership (Joshua 1:16–18)1
1 After the death of Moses the servant of the LORD, the LORD said to Joshua the son of Nun, Moses’ assistant,