by happy chance

Jean-Louis Vignes — his last name by happy chance means “vines” — arrived from France’s Bordeaux wine region in about 1831, and his riverside vineyards, where Union Station now stands, produced some hundreds of barrels a year.

By happy chance, many excellent fossils of Orobates exist, along with trackways — such as footprints — that can be confidently assigned to the creature.

By happy chance, Weiss was almost immediately contacted by the Washington National Opera, where he has been working ever since.

By happy chance, Mr. Cruz has called for that agency to be abolished.

It is not merely by happy chance that all three of Britain's gold medallists in the Olympic Stadium on 2012's Super Saturday have repeated the feat here in the Bird's Nest.