A Greek army of 7,000 hoplites occupied the pass at Thermopylae, and a fleet of 270 ships stationed itself at the nearby Gulf of Artemisium. Unable to take the pass by direct assault, the Persians took a side path and turned the Greek position. Most of the Greeks withdrew, but King Leonidas with 300 Spartans and 700 Thespians refused to retreat, and at the BATTLE OF THERMOPYLAE they were surrounded and annihilated.
这段话，说的是300斯巴达人死守温泉关的事，文中说到波斯人循边路迂回，turned the Greek position。这个turned position不知作甚么解？我就译作“遂抄边路绕过关隘，迂回到希腊军阵地之后”。求教方家。

逆转形式的意思，就是说从劣势转为优势了。类似的还有turn the table.