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THOUSANDS OF TONS
300
250
200
150
100
50
40
30
20
10
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BRITISH (RED) AND FOREIGN (BLACK) MERCHANT SHIPPING LOSSES BY DIFFERENT FORMS OF ENEMY ACTION. (Italian losses are included up to June 10th 1940.)
By Submarine By Mine
By Surface Craft
By Aircraft By other causes or cause unknown.
Naval Intelligence Division Jan. 1941.
SEPT
OCT
NOV
DEC
JAN
FEB
MAR
APR
MAY
JUNE JULY
AUG
SEPT
OCT
NOV
DEC
1939
1940
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251
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