Several campaigns of Coenwulf's against the Welsh are recorded, but only one conflict with Northumbria, in 801, though it is likely that Coenwulf continued to support the opponents of the Northumbrian king Eardwulf.
Rexistráronse varias campañas contra os galeses, mais só un conflito con Northumbria, no 801, aínda que é probábel que Coenwulf continuase a apoiar aos adversarios do rei northumbrio, Eardwulf.