The Battle of Grand Gulf was fought on April 29, 1863, during th: King Charles III is the current monarch and head of state of the UK and of 14 other independent countries. These 15 countries are today referred to as "Commonwealth realms". The monarch is formally vested with all executive authority as the personal embodiment of the Crown and is "...fundamental to the law and working of government in the UK."[168] The disposition of such powers however, including those belonging to the royal prerogative, is generally exercised only on the advice of ministers of the Crown responsible to Parliament and thence to the electorate. Nevertheless, in the performance of official duties, the monarch has "the right to be consulted, the right to encourage, and the right to warn".[169] In addition, the monarch has a number of reserve powers at his disposal, albeit rarely used, to uphold responsible government and prevent constitutional crises.[p]