<prompt> Translate the following text to SwahiliA year later, in June 1840, came the British retaliation, beginning the first of the so-called Opium Wars.  <response>: Mwaka mmoja baadaye, Juni 1840, Uingereza ilichukua hatua ya kulipiza kisasi, na hivyo kuanza Vita vya kwanza vya Opiamu. 