Editing 917 (section)

==== Britain ====
* Summer &ndash; Lady [[Æthelflæd]] of [[Mercia]] cements an [[Military alliance|alliance]] with King [[Constantine II of Scotland]] against [[Scandinavian York|Norse York]]. She captures the fortress at [[Derby]] (belonging to the [[Five Boroughs of the Danelaw]]), while her brother, King [[Edward the Elder]], takes [[Towcester]].<ref>Walker, Ian W (2000). ''Mercia and the Making of England Sutton''. {{ISBN|0-7509-2131-5}}.</ref> Æthelflæd's armies also ravage [[Brycheiniog]] ([[Wales]]) in revenge for killing the Mercian [[abbot]] Ecbryht (see [[916]]).
* [[Battle of Tempsford]]: The English army led by Edward the Elder defeats the Danish Vikings at [[Tempsford]]. They storm the fortified ''[[burh]]'' and kill King [[Guthrum II]] of [[Kingdom of East Anglia|East Anglia]], along with the Danish [[Earl|Jarls]] Toglos and Manna.