Match reference camera, swap materials
Match the camera of the reference video exactly: same opening framing, same angle, same height, same distance, same rotation, same speed, same duration.
Do not change the shot in any way. Keep the citadel and the two army formations in the same screen positions.
Only change the materials: real weathered limestone for the city, real steel armour for the near army, real hide and iron for the far army, real grass and mud for the ground.
Overcast daylight. No interface, no cursor, no text. No studs, seams or plastic.