Kerry received his second Purple Heart for a wound received in action on the Bồ Đề River on February 20, 1969. The plan had been for the Swift boats to be accompanied by support helicopters. On the way up the Bo De, however, the helicopters were attacked. As the Swift boats reached the Cửa Lớn River, Kerry's boat was hit by a B-40 rocket (rocket propelled grenade round), and a piece of shrapnel hit Kerry's left leg, wounding him. Thereafter, enemy fire ceased and his boat reached the Gulf of Thailand safely. Kerry continues to have shrapnel embedded in his left thigh because the doctors that first treated him decided to remove the damaged tissue and close the wound with sutures rather than make a wide opening to remove the shrapnel. Though wounded like several others earlier that day, Kerry did not lose any time off from duty.