God wanted to show His strength to Israel and to Egypt.

Exodus 15:6-8:

 “Your right hand, O Lord, has become glorious in power;
Your right hand, O Lord, has dashed the enemy in pieces.
And in the greatness of Your excellence
You have overthrown those who rose against You;
You sent forth Your wrath;
It consumed them like stubble.

 And with the blast of Your nostrils
The waters were gathered together;
The floods stood upright like a heap;
The depths congealed in the heart of the sea.

What God did to Israel’s enemy in the past, He will do in the future.

Revelation 20:7-9

Now when the thousand years have expired, Satan will be released from his prison and will go out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together to battle, whose number is as the sand of the sea. They went up on the breadth of the earth and surrounded the camp of the saints and the beloved city. And fire came down from God out of heaven and devoured them. 

PRAY FOR THE FEAR OF GOD TO COME ONTO YOUR NATION