At 3 pm on May 4, twelve Devastator torpedo planes and twenty-eight Dauntless dive bombers taking off from Yorktown flew to Tulagi, trying to give the Japanese a heavy blow.
The planes participating in the air strike had no escorting fighters. If Shoho was still around, the zero fighters were likely to annihilate all of Fletcher's aircrafts.
But the Japanese never thought that the U.S. might attack. The Americans sank and damaged 7 enemy ships and bombed the seaplane base by losing only 3 planes.