Blackbeard realized he could use his reputation to greater gain. In April 1718, he sailed north to Charleston, then a thriving English colony. He set up right outside Charleston harbor, capturing any ships that tried to enter or leave. He took many of the passengers aboard these ships prisoner. The population, realizing that none other than Blackbeard himself was off their shores, was terrified. He sent messengers to the town, demanding a ransom for his prisoners: a well-stocked chest of medicine, as good as gold to a pirate at the time. The people of Charleston happily sent it and Blackbeard left after about a week. here