What does the Pasuk mean when it writes "Hashem Ish Milchamah"?
Hadar Zekenim: The heretics 'prove' from here that Hashem is a person. Really, it means that even a mighty warrior must request [help from Hashem] and acknowledge that ha'Kadosh Baruch Hu is the Master, and His name is Hashem.
In all generations Hashem demonstrates His Might on behalf of Yisrael (Targum Yonasan).
Unlike a human king, who goes to war with an army, but alone, in order to make peace (Rashi).
What do we learn from the phrase "Hashem Sh'mo"?
Rashi #1: It teaches us that Hashem fights (not with weapons, but) with His Name alone.
Rashi #2: It comes to teaches that even when Hashem goes to war, to take revenge against His enemies; He continues to feed the entire world with Midas ha'Rachamim. 1
Hadar Zekenim: Even a mighty warrior must request [help from Hashem] and acknowledge that ha'Kadosh Baruch Hu is the Master, and His name is Hashem.
Hadar Zekenim citing Sefer ha'Gan: This is Vadai His name. He is Hoveh 2 with his servants in their distress.