I do not know the reason for your flight, and therefore I do not know by what means your pursuers will assail you.
Not once did they feel the sense of present evil that had assailed them before the attack in the dell.
If we make no answer, the Enemy may move Men of his rule to assail King Brand, and Dain also.
Now pain assailed him, and he felt cold.
But Sauron of Mordor assailed them, and they made the Last Alliance of Elves and Men, and the hosts of Gil-galad and Elendil were mustered in Arnor.
The party was assailed by Orcs in a high pass of the Misty Mountains as they went towards Wilderland; and so it happened that Bilbo was lost for a while in the black orc-mines deep under the mountains, and there, as he groped in vain in the dark, he put his hand on a ring, lying on the floor of a tunnel.
Only the waning might of Gondor stands now between him and a march in power along the coasts into the North; and if he comes, assailing the White Towers and the Havens, hereafter the Elves may have no escape from the lengthening shadows of Middle-earth.
There are no more uses of "assail" in the book.
Show samples from other sources
Serbian forces assailed Bosnian towns.
Discourteous knight, it ill becomes you to assail one who cannot defend himself...