A group remained in Egypt and ruled...
A group remained in Egypt and ruled, and a group went with Moses (as) to the holy lands. However, as the last verse implies, Pharaoh sent his men to the cities of Egypt and gathered enough army and forces. Some commentators say that he sent 600000 men as an advanced guard and he himself followed them with 1000000 soldiers.
They moved fast at night and pursued them and they reached Moses (as) and his people when sun was rising, as the holy Qur’an says: “Then they (Pharaoh’s host) pursued them at sunrise.” Surah Ash-Shu‘ara - Verses 61-62 فَلَمَّا تَرَاءى الْجَمْعَانِ قَالَ أ
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