What are the strengths and weaknesses of the formation of the Macedonian

What are the strengths and weaknesses of the formation of the Macedonian infantry phalanx. In what terrain could the phalanx not operate successfully?

The strong side is that the phalanx is very convenient in defense, especially for protecting some gorge or pass, especially since it was invented in Greece, where the terrain is not flat, but mountains and hills. Weak – she is inactive and horse archers may have an advantage over her. She could not operate in areas where it is difficult to build, for example, mountains.