Analysis Robinson Crusoe: Chapter 1

Robinson Crusoe: Chapter 3
Robinson prepared to go on the same voyage again, though the captain of the Guinea vessel had died and been replaced. Leaving two hundred pounds of his money with the old captain's widow, he voyaged to Guinea again, but "fell into terrible misfortunes."
Robinson's desire and ambition for greater wealth bring him further misfortunes.
Along the way, Robinson's ship was captured by a Turkish pirate ship and he was taken as a prisoner to Sallee, a Moorish port. Robinson was made the slave of the pirate ship's captain. He didn't think his fortune could get any worse, but says that these events were "just a taste of the misery I was to go through."
Ironically, while setting out to make his own life, Robinson ends up losing his individual personhood, becoming a slave. From his retrospective position as narrator, he knows that this was just the beginning of his miseries.
Robinson stayed in Sallee as a slave for two years, constantly thinking of a way to escape but finding none. He finally devised a means of escape when he was sent with a Moor named Ismael and a boy named Xury on a small row-boat to go fishing. He tricked Ismael into loading the boat with plenty of provisions, including gunpowder and guns.
Robinson relies on his own cleverness to plot his escape, rather than waiting for someone else to rescue him.
When Robinson and Ismael went out to fish, Robinson deliberately lost any fish he had hooked, and told Ismael that they needed to go farther out to sea to catch fish. When they were a ways out at sea, Robinson pushed Ismael overboard. He told Ismael to swim back to shore and threatened to shoot him if he tried to swim back to the boat, because he was "resolved to have my liberty."
Robinson is determined to have his own liberty, but this focus on himself makes him rather unconcerned for the wellbeing of others—in this case Ismael, whom he throws overboard.