BdU(Befehlshaber der Unterseeboote, Commander of the Submarines) re-organized the boats then in the North Atlantic into patrol line Siegfried to continue the offensive.
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Still believing their new weapons and tactics gave them an advantage, despite the losses suffered by wolfpack Schlieffen and unaware of the poor results achieved during its attack on convoys ONS 20 and ON 206,
Convoy | Convoy (song) | convoy | Yehiam convoy | Japanese escort ship CD-207 | Convoy, County Donegal | ''CD-207'' | Battle of the Cigno Convoy | No. 207 Squadron RAF | Convoy SC 42 | Convoy SC 129 | Convoy ON 207 | Battlestars: Return of Convoy | Battle of the Tarigo Convoy | Battle of the Duisburg Convoy |
B7 was involved in the battles for convoys ONS 20 and ON 206, ON 207 and ON 208, during which period nine U-boats were destroyed.