The Greek Defense Ministry agreed to make available to the producers up to 5,000 members of the Hellenic Army for a pre-negotiated fee. However, the film's budgetary constraints reduced the numbers drawn to only two battalions (approximately 1,100 men). The largest establishing scenes, of the Persian Army entering Greece, utilized many of these soldiers, together with a combined total of several hundred civilian extras, horses, cattle, ox carts, and chariots. For the wider establishing scenes of the battle, one battalion was retained to play both Greeks (about 450 soldier-extras) and Persians (some 650 soldiers). For closer compositions of the fighting and encampments, military extras were called (call-sheeted) by company-size or smaller units, in meeting the specific needs of the day's shooting schedule. Director of Photography Geoffrey Unsworth made good use of the tree groves, which lined the coastal plain aside the "Limni Vouliagmeni" lagoon, to cover for the obvious deficiency in the number of troops that would have been amassed on the Persian-side of the battle line.