Table:
text: The Blitz
British ports
The Blitz: Estimated Luftwaffe sorties.
Month_Year Day_Sorties_losses Night_Sorties_Losses Luftflotte_2_sorties Luftflotte_3_sorties Major_attacks Heavy_attacks
October 1940 2,300 (79) 5,900 (23) 2400 3500 25 4
November 1940 925 (65) 6,125 (48) 1600 4525 23 2
December 1940 650 (24) 3,450 (44) 700 2750 11 5
January 1941 675 (7) 2,050 (22) 450 1600 7 6
February 1941 500 (9) 1,450 (18) 475 975 – 2
March 1941 800 (8) 4,275 (46) 1625 2650 12 3
April 1941 800 (9) 5,250 (58) 1500 3750 16 5
May 1941 200 (3) 3,800 (55) 1300 2500 11 3

Question: How many heavy attacks did the 450 Luftmarine 2 carry out during the Blitz?