The Franks were without cavalry when they made their first irruption into Gaul.

How strange a thing, this first irruption of the keenest human emotion in the heart of a man!

I saw their first irruption into the square; they were as busy as ants who have lost their eggs.

For instance, let us take Western Virginia, through which the first irruption to the Far West may be said to have taken place.