Synod of Chester led to a battle with a victory for who?
Battle of Chester The Battle of Chester (Old Welsh: "Guaith Caer Legion"; Welsh: "Brwydr Caer") was a major victory for the Anglo Saxons over the native Britons near the city of Chester, England in the early 7th century. Æthelfrith of Northumbria annihilated a combined force from the Welsh kingdoms of Powys, Rhôs (a cantref of the Kingdom of Gwynedd) and possibly Mercia. It resulted in the deaths of Welsh leaders Selyf Sarffgadau of Powys and Cadwal Crysban of Rhôs. Circumstantial evidence suggests that King Iago of Gwynedd may have also been killed.
Battle of the Sabis The Battle of the Sabis, also (arguably erroneously) known as the Battle of the Sambre or the Battle against the Nervians (or "Nervii"), was fought in 57 BC near modern Saulzoir in Northern France, between the legions of the Roman Republic and an association of Belgic tribes, principally the "Nervii". Julius Caesar, commanding the Roman forces, was surprised and nearly defeated. According to Caesar's report, a combination of determined defence, skilled generalship, and the timely arrival of reinforcements allowed the Romans to turn a strategic defeat into a tactical victory.