when the opportunity offers

From the Journals of Lord Byron:

February 23, 1821.

Almost ditto with yesterday — rode, &c. — visited — wrote nothing — read Roman History.

Had a curious letter from a fellow, who informs me that the Barbarians are ill-disposed towards me. He is probably a spy, or an impostor. But be it so, even as he says. They cannot bestow their hostility on one who loathes and execrates them more than I do, or who will oppose their views with more zeal, when the opportunity offers.

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Sources:

Life of Lord Byron, With His Letters And Journals, Vol. 5 (Moore edition)

The Works of Lord Byron (Prothero edition)