Why will He put fire in Egypt?
Malbim: They will be stiff-necked due to the fortress of Sin, and also No was a stronghold surrounded by water - "ha'Seitevi mi'No ha'Yoshevah ba'Ye'orim Mayim Saviv Lah Asher Cheil Yam mi'Yam Chomasah" (Nachum 3:8). Then, He will put fire in Egypt.
It is written Tachil, and we pronounce it Tachul!
Radak: The Kesiv is Hif'il, and the pronunciation is Kal conjugation. It is an expression of "Chil ka'Yoledah 1 " (Yirmeyah 6:24 - trembling).
Malbim: She sits on the birthing stool to expel the child. The membrane is cleaved and opens, and the child comes out. This is a metaphor for the siege cleaving the city.
How will No be cleaved?
Rashi: Its wall will cleave. Malbim - the besieging army will cleave it.
What do we learn from "Tzarei Yomam"?
Rashi: Afflicters will come upon them every day.
Radak: Afflicters will come upon Nof during the day, but not at night, like thieves.
Radak citing Targum Yonasan: Her haters will surround her every day.
Malbim: [People of] Nof will hate day and love night, for then they can hide from the enemy in darkness.