Naval History and Heritage Command

Naval History and Heritage Command

..SUMMARY OF FINAL CLEARANCE SWEEP, SEPT. 8 TO 30.
Date. Sept.
8.
Sept.
9.
Sept.
10.
Sept.
11.
Sept.
11.
Sept.
12.
Sept.
12.
Sept.
13.
Sept.
22.
Sept.
24.
Sept.
25.
Sept.
27.
Sept.
28.
Sept.
29.
Sept.
30.
Total.
Group..................................... 7 7 7 12 11 12 11 9 8 12 5, 6 11 11 6, 3 9 ………………
Cut.........................................     9 2 8 1 1 11 7 1 3 ……………… ……………… ……………… 4 ……………… ……………… 47
Exploded................................     13 3 3 ……………… 2 20 9 ……………… ……………… ……………… ……………… ……………… ……………… ……………… ……………… 50
Countermined........................     2 ……………… ……………… ……………… ……………… 2 1 ……………… ……………… ……………… ……………… ……………… ……………… ……………… ……………… 5
Total............................     24 5 11 1 3 33 17 1 3 ……………… ……………… ……………… 4 ……………… ……………… 102
                                     

1.  Total mines laid by United States in North Sea Barrage................................................................................................................................ 56,611

       

2.  Total United States mines which survived after preamture explosions....................................................................................................... 52,219

     

3.  Total United States mines accounted for in sweeping operations...............................................................................................................  21,295

     

4.  Percentage of United States mines accounted for in sweeping:

   
   

 

 (A)  Based on total mines laid..............................................................................................................................................................        37.6

 
     

 (B)  Based on mines which survived laying.........................................................................................................................................       42.7

 

5.  Total British mines destroyed by United States.................................................................................................................................................     27

     

Source: United States Navy, Office of Naval Records and Library, Historical Section, "The Northern Barrage" (Taking Up the Mines), (Washington, D. C.: Government Printing Office, 1920), 67.

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