sentences:  So alerted, the radar-equipped American cruisers , , , and and five destroyers steamed around the end of Guadalcanal to block the entrance to Savo Sound.At 2235, "Helena"s radar spotted the Japanese fleet, and the Americans successfully crossed the Japanese "T".Both fleets opened fire, but Admiral Goto, thinking that he was under friendly-fire, ordered a 180-degree turn that exposed each of his ships to the American broadsides.