Question: Which battle taking place in 7th century England was the result of peace overtures from Augustine's English mission by the Synod of Chester where the armies of the combined Welsh kingdoms of Powys and Rhôs were virtually annihilated?
Sentence (from "Kanalkampf"): Britain rejected peace overtures and on 16 July, Adolf Hitler issued Directive 16 to the "Wehrmacht" (German armed forces), ordering preparations for the invasion of Britain, under the codename "Unternehmen Seelöwe" (Operation Sea Lion).
Relevant evidence: No