What does Elvenking order his men to do?

In J.R.R. Tolkien's "The Hobbit," the Elvenking, also known as Thranduil, orders his men to detain Thorin Oakenshield and the other dwarves when they are captured in the Elvenking's realm. He seeks to question them about their intentions and the treasure of the Lonely Mountain. Thranduil is particularly interested in the Arkenstone, which is significant to Thorin and the dwarves. His actions reflect his protective nature over his kingdom and his desire to maintain control over the situation.