EXTRA · Side-ring · Parashas Shoftim · Passuk 20:12
But if it will not make peace with you, and it makes war with you, then you shall besiege it.
Chazal / classical source (beyond TT-numbered main-ring units): Sifrei Devarim 200.
Lemma: וְצַרְתָּ עָלֶיהָ.
English: ‘Then you shall besiege it’ – it is a mitzvah to besiege.
Derash classifying the siege (Sifrei) — the language creates a positive duty to lay siege when peace is rejected.
When a city rejects the peace offer and makes war, Yisrael is commanded to besiege it.