Pharaoh chased the Israelites to bring them back to Egypt by force. God didn’t want the Israelites to create awakening from below, which is the expression of their desire for help from the level of Malchut. The patriarchs intervened from above and for their merits God was ready to help them. That is why Moses told the people (Exodus 14:14)
“YHVH will fight for you while you keep silent”
While walking and studying, Rabbi Yossi told Rabbi Yehuda that they studied that the name YHVH that is used in the verse represents the aspect of mercy but here it says that YHVH will make war, which is judgment.
The aspect of mercy is not revealed here because it says later ‘not even one of them remained’.
“וַיָּשֻׁבוּ הַמַּיִם וַיְכַסּוּ אֶת הָרֶכֶב וְאֶת הַפָּרָשִׁים לְכֹל חֵיל פַּרְעֹה הַבָּאִים אַחֲרֵיהֶם בַּיָּם לֹא נִשְׁאַר בָּהֶם עַד אֶחָד”
“The waters returned and covered the chariots and the horsemen, even Pharaoh’s entire army that had gone into the sea after them; not even one of them remained.”
Continued in the next DZ study.