how was gulliver able to win th freedom?

Gulliver's hat is found washed upon the shore, and he asks the emperor to command his men to bring it to him. It is worn from being dragged the half-mile to the kingdom, but it looks tolerably good. The emperor then asks Gulliver to stand up tall with his legs spread apart so that his troops can march through them.Gulliver is finally granted his freedom on the condition that he (1) swear to help the Lilliputians if they are ever in a war, (2) survey the surrounding land, (3) help with any building that needs to be done, and (4) deliver messages. He agrees. In return he will be granted the food and drink sufficient for 1,724 Lilliputians.