en_tn_condensed/isa/37/26.md

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Have you not heard how ... times?

"Certainly you have heard how ... times."

You are here to reduce impregnable cities into heaps of ruins

"I planned that your army would destroy cities and cause them to become piles of rubble"

impregnable

strong and heavily guarded

I am bringing it to pass

"I am causing it to happen" or "I am causing these things to take place"