Event:
In the year of 331 BC battle field Gaguemela. Alaxander against Darius. Of course, Darius had superior numbers, plenty of solid cavalry and suitable terrain, Darius efficiently used the manpower of his vast empire, up to 100,000 men were gathered to fight for their king. 10,000 of the professional Immortal infantry together with a few thousand Greek mercenaries formed the core of the Persian center. But the real power of Darius' army was positioned on the flanks. More than 30,000 fine cavalrymen from various Persian satrapies posed a serious threat, especially on such a wide and level battlefield.
Darius also had a few hundred Indian scythed chariots and even fifteen elephants, To achieve a flanking advantage. Opponent team would have plan in their mind. first distract it. the Macedonian king started to move his line right, but Darius immediately countered by stretching his left flank and matched the opponent's movement. Darius had the battlefield leveled and cleared off any obstacles for more effective chariot use, which is why he wanted to prevent the Macedonians from leaving the prepared ground. Persian cavalry moved out and attacked Alexander's far right. But, this was bait. Doing so exposed Darius’s own centre. Alexander had waited for such an opportunity, he swiftly moved Companion cavalry supported by the remaining units of his flank and struck the Persian centre, right where Darius' exposed royal guard stood.
Lesson:
#1. First, they take down our surrounding support... then we will become imbalanced.... that enough for them to penetrate...
#2. Second, they break our center part... I mean... our faith part.... confident... then we will become weak...
#3. best way to defend ourselves... follow the enemy lines... dont ask "how", but ask, "why"... understand their motto.... you can easily tackle them down. for that speak to yourselves in order to motivate yourself. you will become stronger.