Shulchan Aruch, chelek Orach Chaim, Siman 329, Sif 6:
עכו”ם שצרו על עיירות ישראל אם באו על עסק ממון אין מחללין עליהם את השבת
באו על עסק נפשות ואפי’ סתם יוצאים עליהם בכלי זיין ומחללים עליהם את השבת
ובעיר הסמוכה לספר אפילו לא באו אלא על עסקי תבן וקש מחללין עליהם את השבת
הגה ואפילו לא באו עדיין אלא רוצים לבא [א”ז]:
(6) Regarding non-Jews who besiege Jewish cities:
If they come for money, we do not desecrate the Shabbat [to protect ourselves],
but if they came to kill or come with no presented reason,
we go out with weapons and desecrate the Shabbat.
In a city that is near the border, even if they just come for straw or hay,
we desecrate the Shabbat.
Rem”a: Even if they haven’t come but they want to come (Or Zarua).
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FULL DISCLOSURE:
This is not my English translation;
I just copied it from www (dot) sefaria (dot) com.
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CONCLUSION:
Those who say that are not permitted to “physically fight the enemy”
[like “SomeJewIKnow”] are contradicting the Shulchan Aruch and Rambam.
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PERSONAL COMMENT:
A few weeks ago, “SomeJewIKnow” falsely slandered me,
on this web site, and in this Coffee Room, by falsely claiming
that I think that women should be Gedolei Torah.
I NEVER believed that, and I NEVER said that,
and I NEVER said anything similar to his false slander against me.
A few weeks ago, “SomeJewIKnow” falsely slandered me,
on this web site, and in this Coffee Room, by falsely claiming
that I think that believers in J—– should be Gedolei Torah.
I NEVER believed that, and I NEVER said that,
and I NEVER said anything similar to his false slander against me.
SomeJewIKnow does not know Halachah, and he is a Baal Motzi Shem Ra.