When this horrible din had lasted a certain time, it mechanically awoke Mr. Wopsle's great-aunt, who staggered at a boy fortuitously, and pulled his ears.
Charles Dickens. Great Expectations (1861)
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One atom of matter cannot meet another by chance; this meeting is the effect of permanent laws, which cause every being necessarily to act as it does, and hinder it from acting otherwise, in given circumstances. To talk of the fortuitous concourse of atoms, or to attribute some effects to chance, is merely saying that we are ignorant of the laws, by which bodies act, meet, combine, or separate.
Baron D'Holbach. Good Sense (1772)
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The course of events was fortuitous and unforeseen by either side.