Rear Admiral Tamon Yamaguchi , leading Carrier Division 2 ( `` Hiryū '' and `` Sōryū '' ) , recommended that Nagumo strike immediately with the forces at hand : 18 Aichi D3A1 dive bombers each on `` Sōryū '' and `` Hiryū '' , and half the ready cover patrol aircraft .
Rear Admiral Tamon Yamaguchi , leading Carrier Division 2 ( `` Hiryū '' and `` Sōryū '' ) , recommended that Nagumo strike with the forces at hand : 18 Aichi D3A1 dive bombers each on `` Sōryū '' and `` Hiryū '' , and half the cover patrol aircraft .