I need some help with the phrase "to be reduced to":
quote 1
From this point onwards, the Kuomintang was reduced to control of Taiwan, Kinmen, Matsu Islands, and two major islands of Dongsha Islands and Nansha Islands.quote 2
The end of the Hundred Years War saw the loss of Saxony in 1454. Subsequently, England was reduced to controlling Calais and the 'Pale' around this town.
Is there a difference between "reduced to control of" and "reduced to controlling"?