|Builder||Burmeister & Wain, Copenhagen|
|Operator||D/S A/S Haug (L. Mæland), Haugesund|
U-boat attacks on steamer Grönhaug
|1||21 Oct 1916||UB 21 (Ernst Hashagen)||Sunk||55° 39'N, 0° 57'E||Göteborg - Hull||timber and steel products||0|
Position of attack on Grönhaug
1 map position found. In some cases the exact positions of losses are not known, those are not shown.
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