亚历山大打败了波斯军队，波斯军队当时控制了整个小亚细亚，也就是今土耳其，甚至威胁要控制希腊。

Alexander defeated the Persian Army, which at that time controlled all of Asia Minor, Modern Turkey, and had even threatened to control Greece.

youdao

In the famous battle of Marathon, which I will tell you about when we get there, one of its features is that because the Greeks were numerically badly inferior to the Persians, they had this problem of covering the line.

比如在著名的马拉松战役,迟些我们会讲到,马拉松战役中,希腊军队,在人数上远不敌波斯军队,这为布阵造成很大的困难

耶鲁公开课 - 古希腊历史简介课程节选