Simple past tense and past participle of set on fire.(verb)
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Use "set on fire" in a sentence
"He evidently had been in the office, engaged in earnest wrestling prayer; said he, "Brother Kinney, join me in praying that our Churches may be set on fire of God.""
"A fine little ship, called the Albion, of Bermuda, set on fire by the Glory."
"The Chancellorsville House, which had been set on fire by shell, was seen to spout flame from every window, and the adjoining woods had, in like manner, caught fire, and were heard roaring over the dead and wounded of both sides alike."