Proverbs 16:32 contrasts ruling one's spirit with capturing a city — same military metaphor showing self-control as greater victory.

Proverbs 12:16 contrasts the fool who shows vexation at once with the prudent who ignores insults — the lack of self-control shown here.

Proverbs 14:29 praises slow to anger as great understanding — the opposite of the defenseless city here.

Proverbs 19:19 shows that a wrathful man faces penalty — the consequence of lacking the walls of self-control.

Proverbs 22:24 warns against befriending an angry person — someone lacking self-control like the vulnerable city here.

James 1:19 commands being slow to speak and slow to anger — the self-control that fortifies the walls here.

1 Samuel 20:30 shows Saul's uncontrolled anger — a vivid example of the defenseless state described here.