Naval tactics throughout the 16th century and well into the 17th century, however, was focused on countering the oar-powered galleys that were armed with heavy guns in the bow, facing forwards, which were aimed by turning the entire ship against its target. Though far less seaworthy than sailing vessels and highly vulnerable to boarding by ships that rode higher in the water, the galleys were a serious threat due to their ability to aim accurate heavy gunfire low in the hulls of larger sailing ships and to escape solely sail-powered opponents by rowing into the wind.