The word(s) "defend" appears 13 time(s) in 13 verse(s) in Quran in Mohsin Khan translation.

(11) There will be sent against you both, smokeless flames of fire and (molten) brass, and you will not be able to defend yourselves.

(12) He it is Who drove out the disbelievers among the people of the Scripture (i.e. the Jews of the tribe of Banu An-Nadir) from their homes at the first gathering. You did not think that they would get out. And they thought that their fortresses would defend them from Allah! But Allah's (Torment) reached them from a place whereof they expected it not, and He cast terror into their hearts so that they destroyed their own dwellings with their own hands and the hands of the believers. Then take admonition, O you with eyes (to see).

(13) "My power (and arguments to defend myself) have gone from me!"