The plainsmen and the hill dwarves did not trust each other, but thanks to the cunning of Pheragas, Reghar and Darknight agreed to cooperate, (swelling or which swelled) the dark wizard’s army to three times its former size.
Top answer
I like 'swelling' more because it maintains the flow of the sentence in my opinion. However, I'm sure some people will disagree with me.
— Gene N
I like 'swelling' more because it maintains the flow of the sentence in my opinion.
However, I'm sure some people will disagree with me.
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I was intrigued to see that this forum does not recognize 'cunningness' as the noun of 'cunning' when it is listed in the online oxford dictionary. As far as I know, 'cunning' is used as a noun only in American English but then I might be wrong on this.
I try to use at least one word a day that stymies this spellchecker. "Cunning", noun, Middle English, is an entry word in the Shorter Oxford, 5th edition. It is listed without comment with the definition you would expect. It is from Late Middle English in the modern definition, so an Americanism it assuredly is not. "Cunningness" is listed in other forms, also LME.