Why did the doctor decide to move his men to the stockade in Treasure Island?

In "Treasure Island," the doctor decided to move his men to the stockade for strategic safety. After realizing the threat posed by Long John Silver and his crew, he believed the stockade would provide a defensible position, allowing them to better protect themselves and maintain control over their resources. The stockade's fortified structure offered a more secure environment for the loyal crew amidst rising tensions and potential betrayal.