Really? You guys are on your own there... That film was one of the few films I'd like to see put on trial... right up there with First Knight.
Sure they "tried" to be "accurate", but in the end they just did more of the Hollywood crap: Dual sword wielding, setting fields of oil on fire, siege weapons vs infantry, swords worn on back, martyrdom of a main character, mix-match armor and weapons, and a whole list of other issues;
Roman legions withdrawing from Britain in 467 AD vs, in reality, it was completed in 410 AD, Pelagius wasn't executed for heresy in Rome as the film indicates, The Saxons are shown attacking Hadrian's Wall from the north. By 467 the Saxons were already occupying parts of Britain far south of the wall, and never invaded Scotland, Historically, Sarmatians were armored in the manner of cataphracts (full-length coats of scale armor); the film's Sarmatians are armoured with a mishmash of pseudo-Roman, Turkish, Mongol, and Hunnic designs.
The Saxons historically used bows (to a limited extent) and spears instead of crossbows during the period, Similarly, the Woads use a trebuchet-like weapon to hurl flaming missiles at the Saxons, though the trebuchet was not re-introduced to Britain until the siege of Dover in 1216, Blue fabric dye was not founded in Europe until the 13th century, Arthur refers to his fellow soldiers as Knights. The concept of Knights did not come about until the Middle Ages, One of the knights is showing with a falconry-trained Harris hawk (an American species), long before America was known of in Britain.
Elements of the film's promotion have likewise been criticized as historically unsound. Its tagline "The True Story Behind the Legend" has been criticized as false. A trailer for the film claims that historians now agree that Arthur was a real person because of recent archaeological findings; however, historians do not. There is no consensus amongst historians on Arthur's historicity and no recent archaeological find proves Arthur's existence;
Just some observations other have noted. I was really hoping for a decent film, but left soured.