(i) Identify the ablative absolute and (ii) translate the sentence into good English: 'Urbe capta, hostes cives occiderunt.'

(i) Urbe (3rd declension feminine noun) capta (past participle passive in agreement with urbe). The ablative noun and participle are 'cut off' from the rest of the sentence - if we removed the phrase from the sentence, it would still make perfect sense.
(ii) After the city was captured, the enemy slew the citizens.