Which preposition to use with thwack

across Occurrences 1%

Then I was goin' to lead you" The flat of a heavy hand struck with a resounding thwack across his lips.

in Occurrences 1%

No one, no true Somali, that is, objected to a prod in the heart with a shovel-headed spear, a thwack in the head with a hammered slug, a sweep at the neck with a big swordbut to have a person sawing at your throat with weak and shaking hands is rotten....

on Occurrences 1%

he said, with a resounding thwack on his knee.

with Occurrences 1%

"Wouldst thou strike a man when he is down?" "Ay, marry would I," quoth the Tanner, giving him another thwack with his staff.

Which preposition to use with  thwack