Wiktionary
prep. (alternative form of on the heels of English)
Usage examples of "upon the heels of".
I pray you will do the honor of understanding me when I say that Leng's visit, coming upon the heels of such strange events at the Cabinet, had precisely the opposite effect to which he had intended.
THE two startling declarations, one treading upon the heels of the other, set Jim Frobisher's brain whirling.
But, as though obeying a second thought that came quickly upon the heels of the first impulse, he did not complete the movement.
What Gunnar could do with wizardry, perhaps he could accomplish with order-mastery and the powder in the rockets, since his senses indicated that the Whites were not immediately upon the heels of the remaining Sarronnese.
A second burst upon the heels of the first alternately laughing and shrieking as a madman.
For some time he found one disappointment following upon the heels of another in quick succession.