Assertion: convoy's loss | /r/HasProperty | suffered by wolfpack schlieffen
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text: 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, Befehlshaber der Unterseeboote (BdU) re-organized the boats then in the North Atlantic into patrol line Siegfried to continue the offensive.